Sigma 90mm f/2.8 DG DN Review: Leica Quality for $600 (L-Mount)
This is the second of two Sigma lens reviews I have done recently and this lens is no slouch either. The 90mm f2.8 DG DN Sigma lens is a very well made little prime lens and this particular copy is for the L mount for Leica and Panasonic cameras. I am sure Sigma makes this lens for other lens mounts as well, but I dont have that list with me so I cant speculate past that.
This is the second of two Sigma lens reviews I have done recently and this lens is no slouch either. The 90mm f2.8 DG DN Sigma lens is a very well made little prime lens and this particular copy is for the L mount for Leica and Panasonic cameras. I am sure Sigma makes this lens for other lens mounts as well, but I dont have that list with me so I cant speculate past that.
Sigma 90mm f/2.8 DG DN: Technical Specifications
Before we dive into the hands-on experience, here are the specs:
Optical Design:
Focal length: 90mm
Maximum aperture: f/2.8
Minimum aperture: f/22
Aperture blades: 9 (rounded for smooth bokeh)
Physical Specs:
Mount: L-mount (Leica SL/CL, Panasonic S-series)
Filter size: 55mm
Length: 2.4 inches (61.6mm)
Weight: 10.4 oz (295g)
Minimum focus distance: 19.7 inches (50cm)
Construction:
All-metal barrel
Aperture ring with 1/3 stop detents
AF/MF switch on lens barrel
Weather sealing: No (one downside vs Leica)
Price:
Sigma 90mm f/2.8 DG DN: ~$600
Leica APO-Summicron-SL 90mm f/2 ASPH: ~$5,395
Yeah, that's not a typo. The Leica costs nine times more than the Sigma. Let's see if that price difference is justified!
What is 90mm Good For? Use Cases and Focal Length
If you're not familiar with 90mm as a focal length, let me explain why this is such a useful lens to have:
Portrait Photography: 90mm is a classic portrait focal length! It gives you nice compression, flattering perspective, and enough working distance that you're not right in your subject's face. The f/2.8 aperture provides good subject separation without going overboard. This is what I'd grab for environmental portraits where I want context but still want the subject to stand out.
Street Photography: At 90mm, you get compressed perspective that makes street scenes feel more intimate. You can shoot from across the street without being obvious, and the focal length picks out details in a way that 35mm or 50mm just can't. It's not a run-and-gun street lens, but for deliberate composition? It's great!
Detail Work: Need to photograph architectural details, signage, or anything where you want isolation without getting too close? 90mm is perfect. I use this focal length all the time for documenting buildings and urban details in Chattanooga.
What 90mm is NOT good for: Wide landscapes (too narrow), group photos in tight spaces (you'll run out of room to back up), and anything requiring fast reaction (it's a slower, more deliberate focal length). Know your lens's strengths!
The Sigma 90mm f/2.8 DG DN with its lens hood attached. Notice how the hood is almost as big as the lens itself! This is a genuinely compact 90mm prime lens.
In the photo below you can see how small the lens actually is. The lens hood takes up almost as much space as the lens itself. That is crazy! With the all metal construction and well made optical formula, this lens is also punching up as they say.
Size comparison showing how small this lens actually is. The lens hood takes up almost as much space as the lens itself. That's crazy for a 90mm focal length! With all-metal construction and excellent optics, this little lens is punching way above its weight.
Some notable differences between the Sigma lens and my Leica counterparts are that the Sigma lens actually has an aperture ring on it that also has 1/3 stop detents. This is really nice as it allows manual aperture control to be basically mapped to a control surface that photogs are accustomed to using. If you want the usual camera control for the aperture, then simply turn the aperture ring to the “A” position and your ready to go. Ít couldn’t be simpler.
The aperture ring on the Sigma 90mm with 1/3 stop detents. This is a really nice feature that allows manual aperture control mapped to a control surface photographers are already used to. Turn it to "A" for camera-controlled aperture. Simple and intuitive!
The next thing they did on the lens that I am not so sure I like yet is to put a switch to choose between manual and automatic focus. The Leica lenses use a software control to do this and it is pretty simple to implement and once you get used to doing it that way it really is a good system. There are less openings in the lens to let water in and the control is right they with the various auto focus modes all in one spot. The Sigma system has you choose manual or auto on the lens and then if you choose auto, you have to further goto the software and choose the automatic mode you want. It makes choosing autofocus a two step affair. This is probably just a user issue where I lack practice with the lens, but this seems a little clumsy compared to the Leica process. It is possible that Leica didn’t share all the tech needed to make this happen, I don’t know, but like I said I am on the fence on this one.
The AF/MF switch on the lens barrel. This is the one design choice I'm not sold on yet. Leica lenses use software control for focus modes in one step. The Sigma requires you to switch here first, then choose the AF mode in the camera menu. It's a two-step process that feels clumsy compared to Leica's system. Still works fine, just takes getting used to!
Lastly is image quality. The Sigma has it. It produces sharp, distortion free images with good color and exposure. What more can I say here? It really is amazing what you get for the price. These lenses can run with the big boys, in my opinion, just fine. If you pixel peep deep enough you might find fault in them, but only photographers do that. The normal person never digs into the corners or zooms into 500% on a photo so I am not going to rate this lens like that either. The photos look wonderful…just look at the ones below.
Sample Photos: What This Lens Can Do
Let me show you what this lens can actually produce in real-world use. These are all shot with the Sigma 90mm f/2.8 on my Leica SL2:
Sample photo shot with the Sigma 90mm f/2.8 on my Leica SL2. Look at the sharpness, color rendering, and contrast! This lens produces distortion-free images with excellent detail. What more can you ask for at this price point?
Look at the sharpness across the frame! The colors are accurate without being oversaturated, the bokeh is smooth and not distracting, and the compression at 90mm makes these compositions work. The first photo shows how this lens handles contrast and detail in mixed lighting. The second demonstrates subject isolation at f/2.8. The third shows color rendering in challenging light.
This is what you're getting for $600. Not "budget lens performance." This is legitimate high-quality glass that happens to cost less than the Leica equivalent.
One thing to note: these photos weren't babied. I was shooting handheld in various lighting conditions, some shots were wide open at f/2.8, and I didn't do any special post-processing beyond my normal workflow. This is real-world performance, not controlled test charts!
Another example of what this lens can do. The 90mm focal length gives you nice compression and the f/2.8 aperture provides good subject separation. The bokeh is smooth and not distracting. This is Leica-quality glass at a fraction of the cost!
More proof that the Sigma 90mm delivers excellent image quality in real-world use. Colors are accurate without being oversaturated, detail is sharp across the frame, and the lens handles mixed lighting well. These aren't test charts, this is actual photography!
Final sample showing the Sigma 90mm's capabilities. Shot handheld in Chattanooga during a block party. The lens is sharp, colors look great, and the compression at 90mm makes the composition work. If you want great glass at a fraction of Leica's price, this lens is the ticket!
Sigma vs Leica: Is the Price Difference Worth It?
Let's address the elephant in the room: Leica makes a 90mm lens for L-mount. The Leica APO-Summicron-SL 90mm f/2 ASPH costs about $5,400. The Sigma costs $600. That's a $4,800 difference.
What do you get for that extra $4,800?
The Leica advantages:
One stop faster (f/2 vs f/2.8)
APO designation (apochromatic correction, minimal chromatic aberration)
Legendary Leica color rendering and micro-contrast
Full weather sealing
Leica brand prestige (if that matters to you)
Probably slightly sharper wide open (though the Sigma is already sharp!)
The Sigma advantages:
Costs $600 instead of $5,400
Still produces excellent images (as you can see from my samples!)
Aperture ring with detents (Leica's is clickless)
Compact and lightweight
You save $4,800 that you can spend on other lenses or, you know, food!
My take: If you're a professional portrait photographer who needs f/2 and perfect optical performance for paying clients? Maybe the Leica is worth it. If you're a Leica SL2 shooter who wants excellent 90mm performance without spending a small fortune? The Sigma is absolutely the right choice.
I'd rather have the Sigma 90mm f/2.8 plus a Sigma 35mm and 65mm for the same price as one Leica 90mm. That's three lenses versus one! Unless you're chasing that last 5% of optical perfection, the Sigma is the smart buy.
Pros, Cons, and Who Should Buy the Sigma 90mm f/2.8
Let me break down the good and the not-so-good about this lens:
What I Love (Pros):
Image quality is excellent: Sharp, great color, minimal distortion
Compact size: Fits easily in a bag, lens hood is bigger than the lens!
Aperture ring with detents: Manual aperture control feels great
All-metal construction: Feels solid and well-made
Price: $600 vs $5,400 for the Leica equivalent
Real f/2.8: Not a variable aperture zoom, consistent light gathering
What I Don't Love (Cons):
Two-step focus mode selection: AF/MF switch on lens PLUS software menu selection feels clumsy compared to Leica's one-step software control
Only f/2.8: If you need f/2, you'll have to step up to the Leica (and pay 9x more)
No weather sealing: Leica lenses are weather sealed, this isn't
Learning curve: Takes some getting used to if you're coming from Leica's system
Who Should Buy This Lens:
Leica SL2 or Panasonic S-series shooters on a budget
Portrait photographers who want 90mm without spending $5,000+
Anyone building an L-mount lens kit and prioritizing value
Street photographers who like compressed perspective
Photographers who appreciate manual aperture rings
Who Should Skip This Lens:
People who absolutely need f/2 or faster
Photographers who require weather sealing for their work
Anyone who already owns the Leica 90mm f/2 (obviously!)
Wide-angle shooters (this isn't your lens!)
Support this website by using these affiliate links to shop on Amazon:
Sigma 90mm F2.8 DG DN for L Mount
Nikon AF-S FX NIKKOR 105mm f/1.4E ED Lens
Voigtlander Nokton 35mm f/1.4 II
Sandisk 128GB Extreme Pro memory cards
Final Thoughts
So in conclusion, if you want great glass at a fraction of the cost of Leica, this lens is just the ticket. Sigma has done a complete 180 from the last time I used one over a decade ago and that makes me happy.
Here's my bottom line: The Sigma 90mm f/2.8 DG DN is the lens Leica SL2 shooters should buy if they can't justify $5,400 for the Leica version. And honestly? Most people can't and shouldn't justify that price difference. The Sigma produces excellent images, feels solid, and costs less than many Leica lens hoods!
The only real downsides are the two-step focus mode selection (which is a user interface annoyance, not a deal-breaker) and the lack of weather sealing. If those don't bother you, this lens is a no-brainer for L-mount shooters.
Sigma has seriously stepped up their game in recent years. I remember using Sigma lenses a decade ago and being underwhelmed. These new DG DN lenses for mirrorless mounts? They're competitive with first-party glass at a fraction of the price. This is exactly what the L-mount system needs—excellent third-party options that don't compromise on quality.
Would I rather have the Leica 90mm f/2? Sure, if someone else is paying for it! But would I rather have the Sigma 90mm plus four other Sigma primes for the same money? Absolutely. That's the math that makes sense for most photographers.
Now get your camera out and go take a picture with it!
Carl Zeiss Jena Biotar 58mm f/2 Review: 60-Year-Old Vintage Magic
When Aaron offered to loan me his 58mm, I had no idea it was a Zeiss and over 60 years old. But once I held it in my hands, the history became obvious. This isn't just any vintage lens. It's a Carl Zeiss Jena Biotar from East Germany!
The Carl Zeiss Jena Biotar 58mm f/2 from East Germany. This lens is over 60 years old and still producing beautiful images! Notice the all-metal construction and vintage styling. This is German engineering that lasts!
Carl Zeiss Jena Biotar 58mm f/2: A 60-Year-Old Lens
When Aaron offered to loan me his 58mm, I had no idea it was a Zeiss and over 60 years old. But once I held it in my hands, the history became obvious. This isn't just any vintage lens. It's a Carl Zeiss Jena Biotar from East Germany!
The Carl Zeiss Jena Story: After World War II, the original Carl Zeiss optical company in Germany was split between East and West. The Jena facility ended up in East Germany (DDR), while the West German operation continued in Oberkochen. For decades during the Cold War, there were TWO Carl Zeiss companies making lenses! The East German Carl Zeiss Jena produced exceptional optics throughout the 1950s, 60s, 70s, and into the 1990s.
The Biotar design dates back to the 1920s-1930s and is a double Gauss optical formula. This particular 58mm f/2 version was produced primarily in the 1960s and early 1970s. That means this lens I'm holding is literally 60+ years old and still producing sharp images! That's German engineering right there.
What makes Carl Zeiss Jena lenses special today is that they were made to the same high standards as West German Zeiss, but now they're available on the used market for a fraction of what modern Zeiss lenses cost. You can find these Biotar lenses for $100 to $300 depending on condition, versus thousands for a modern Zeiss prime!
Well, it didn’t take long to figure that out and to round up a simple M42 to Leica L mount adapter so I could get this lens on my Leica SL2.
The next thing I did was look the lens over really closely. The usual controls are there of aperture and focus but it has a third ring as well. This ring is spring loaded and is some sort of adjustable stop for the minimum aperture. This is how it works, you pull the ring towards the camera, compressing the spring. While the spring is compressed, you rotate the ring and align a mark on it with the aperture you want it to stop at. Once here, release the spring and it will seat in this position stopping the aperture ring from stopping down past this point. This was for cameras back in the day as you had to meter the scene manually then set the aperture for the meter value. To compose though, you needed all the light you could get so you set the ring for the aperture you plan to shoot the photo at then you would open the aperture all the way to see good and get good focus. Once this was done, you could simply spin the aperture ring to the stop and it was set to the metered value and you didnt even have to come off the camera to do it. Pretty slick if you ask me.
Another item of note is that the aperture ring is ”clickless” or in other words, it simply turns smoothly through the range without any detents to locate it at specific settings.
The next thing I noticed is that the machine work is impeccable…which I have grown to expect no less from the German people. The focus ring is smooth as silk even with its advanced years. Quite the opposite of some of my other lenses to be quite honest.
330 Degrees of Focus Throw: Close Focus Priority
Something else I noticed is that the lens has incredible close focus with about 330 degrees of focus throw. Of that 330 degrees it devotes probably 250 degrees to close focus. Crazy precise focus for a lens this old. The first 1/4 turn though is the normal use range so it will go from infinity to 2.5 meters in that 1/4 turn and then the rest of the throw is for close range work. Pretty neat how the normal range stuff is in such a short throw so you can get focus fast with it. Just a little practice and you a can get street photos of moving subjects and fairly large apertures in focus. You just learn how to use it with some time.
Sample Photos: What This Vintage Lens Can Do
Let me show you what this 60-year-old lens can actually produce on a modern 47-megapixel Leica SL2:
Portrait of Teresa shot with the Biotar at a local state park. Look at that sharpness and the smooth bokeh! This is what makes vintage lenses so cool—they still got it after 60+ years. Razor sharp where it matters with beautiful rendering.
Teresa's Portrait: Look at that sharpness! The Biotar is razor sharp at f/2 where it matters (Teresa's face and eyes), with smooth falloff to the background. The 15-blade aperture creates beautifully smooth bokeh without harsh edges. This is exactly what you want in a portrait lens. The rendering has that vintage "look" that's hard to describe but you know it when you see it. Colors are slightly warm, micro-contrast is excellent, and the overall feel is organic rather than clinical.
Walk Around Shots: The other samples show the Biotar's versatility as a general-purpose lens. At 58mm, it's slightly longer than the standard 50mm, which gives you a bit more reach for street photography while still being wide enough for environmental shots. I took these during photowalks around Chattanooga, just grabbing scenes that caught my eye. The lens renders these scenes with great detail and pleasant tonality.
What Makes Vintage Rendering Special: Modern lenses are designed to be clinically perfect. Flat field correction, perfect color neutrality, zero distortion. That's great for product photography or technical work! But vintage lenses like the Biotar have character. Slight warm color cast, gentle vignetting, bokeh that's smooth rather than razor-sharp. It's the difference between digital perfection and analog soul. Not better or worse, just different. And for portraits or artistic work? I'll take the vintage rendering every time!
Technical Specifications and Pricing
Here are the specs for this vintage glass:
Optical Specs:
Focal length: 58mm (slightly longer than standard 50mm)
Maximum aperture: f/2
Minimum aperture: f/16
Aperture blades: 15 (yes, fifteen! Creates smooth bokeh)
Optical design: Double Gauss (Biotar formula)
Physical Specs:
Mount: M42 screw mount (universal vintage mount!)
Filter size: 49mm
Weight: Approximately 290g (10.2 oz)
Length: About 45mm
Focus throw: 330 degrees (!) with close focus priority
Minimum focus distance: Approximately 0.5 meters (very close!)
Age and Origin:
Manufactured: 1960s-1970s (60+ years old!)
Origin: Carl Zeiss Jena, East Germany (DDR)
Production numbers: Relatively common, still available used
Used Market Pricing:
Typical price: $100-300 depending on condition
Excellent condition: $200-300
Good condition with some wear: $100-180
Compared to modern Zeiss Batis 55mm f/1.8: $900+
The value proposition here is incredible! You're getting genuine Carl Zeiss optics with 60+ years of proven performance for less than the cost of a cheap modern lens. That's what makes vintage glass so appealing!
It is not a bad lens in any way either, just look at the photo of Teresa I got at the local state park one day with it. Razor sharp and great rendition too. This is what makes vintage lenses so cool, they still got it…
The Biotar works great as a general purpose walk around lens too. I grabbed this during a photowalk in Cloudland Canyon State Park. The lens renders scenes with excellent detail and pleasant tonality. This is real-world performance, not controlled test shots!
Adapting M42 Lenses to Modern Mirrorless
One of the best things about the Biotar 58mm is that it uses the M42 screw mount. If you're not familiar with M42, let me explain why this is actually a huge advantage!
What is M42 Mount? M42 (also called "Universal Screw Mount") was THE standard lens mount for decades, used by dozens of camera manufacturers from the 1940s through 1980s. Companies like Pentax, Praktica, Zenit, Fujica, Mamiya, and many others all used M42. This means there are millions of M42 lenses out there on the used market!
Why M42 is Great for Modern Mirrorless: The M42 flange distance (the distance from the lens mount to the sensor) is 45.46mm, which is longer than any modern mirrorless mount. This means you can adapt M42 lenses to pretty much ANY mirrorless camera with a simple, inexpensive adapter. No optics needed, just a metal ring!
Adapters are Cheap and Easy:
M42 to Leica L-mount adapter: $15-40
M42 to Sony E-mount: $10-30
M42 to Canon RF: $20-40
M42 to Nikon Z: $15-35
I'm using a simple M42 to L-mount adapter that cost me about $25 on Amazon. No electronics, no optics, just a precisely machined metal ring. Screw the Biotar into the adapter, mount it on my Leica SL2, and boom! I've got a working 58mm f/2 lens.
Manual Focus on Modern Mirrorless: The beauty of using vintage manual lenses on modern mirrorless cameras is focus peaking! My Leica SL2 shows colored highlights on in-focus areas in the electronic viewfinder, making manual focus actually easier than it was back in the 1960s with optical viewfinders. Combined with the Biotar's smooth 330-degree focus throw, you get precise control that's honestly pretty enjoyable!
What You Give Up:
No autofocus (obviously!)
No electronic aperture control
No EXIF data recorded
No lens corrections applied
What You Gain:
Incredible value ($100-300 vs $900+ for modern Zeiss)
Built-in character and vintage rendering
All-metal construction that'll last another 60 years
The satisfaction of using historic glass!
Another example of the Biotar's versatility. At 58mm, it's slightly longer than the standard 50mm, giving you a bit more reach while still being wide enough for environmental shots. The vintage rendering has character that modern lenses don't replicate!
The Biotar's close focus capability is impressive! That 330-degree focus throw with close focus priority means you can get really close to subjects. This 60-year-old lens works beautifully on my modern 47-megapixel Leica SL2.
Final sample showing what this vintage lens can do in real-world use. If you're into the vintage glass look, the Biotar is definitely worth grabbing if you can find one. Genuine Carl Zeiss optics for $100-300? That's incredible value!
Pros, Cons, and Who Should Buy the Biotar 58mm
Let me break down the good and the not-so-good about this vintage lens:
What I Love (Pros):
Build quality is exceptional: German engineering from 60+ years ago that still works perfectly
f/2 is fast enough: Good low light capability, nice bokeh
Incredible close focus: That 330-degree throw with close focus priority is amazing
Unique mechanical features: Adjustable aperture stop, clickless aperture ring
M42 mount universality: Adapts to any modern mirrorless camera easily
Price: $100-300 for genuine Carl Zeiss optics!
Vintage rendering: Character and soul that modern lenses don't have
15-blade aperture: Smooth, round bokeh
What I Don't Love (Cons):
No autofocus: Manual focus only (but focus peaking helps!)
No EXIF data: Camera doesn't know what lens you're using
Some copies are soft: Vintage lenses vary in condition, test before buying
Not weather sealed: It's 60 years old, be gentle!
Clickless aperture: Great for video, but some photographers prefer detents
Requires adapter: Extra $15-40 expense and adds a bit of length
Who Should Buy This Lens:
Vintage lens enthusiasts who appreciate the history
Portrait photographers wanting unique rendering
Budget shooters who can't justify $900+ for modern Zeiss
Film aesthetic lovers who want that organic look
People who enjoy the slower, more deliberate manual focus process
Collectors interested in Carl Zeiss Jena heritage
Who Should Skip This Lens:
Anyone who needs autofocus for their work
Sports or action photographers
People who want perfectly clinical modern rendering
Photographers who hate manual focus
Anyone expecting modern lens perfection
Frequently Asked Questions About the Carl Zeiss Jena Biotar 58mm f/2
What is Carl Zeiss Jena and how is it different from regular Zeiss?
Carl Zeiss Jena was the East German optical manufacturer that operated from 1946 to 1991 after the original Carl Zeiss company was split following World War II. The Jena facility ended up in East Germany (DDR), while West German Zeiss continued in Oberkochen. For decades during the Cold War, there were TWO Carl Zeiss companies both making excellent lenses! Carl Zeiss Jena lenses were made to the same high standards as West German Zeiss but are now available on the used market for much less money. The quality is genuinely excellent, it's just Cold War history that created the split!
How much does a Carl Zeiss Jena Biotar 58mm f/2 cost?
On the used market today, you can find the Biotar 58mm f/2 for $100 to $300 depending on condition. Excellent condition copies with clean glass go for $200-300, while good working copies with some cosmetic wear run $100-180. Compare that to a modern Zeiss Batis 55mm f/1.8 which costs $900+, or a Leica Summilux 50mm which is $4,000+. You're getting genuine Carl Zeiss optics with 60+ years of proven performance for less than the price of a cheap modern lens. That's incredible value!
What is M42 mount and can I use it on modern cameras?
M42 (Universal Screw Mount) was the standard lens mount used by dozens of camera manufacturers from the 1940s through 1980s. The beauty of M42 is that it adapts to pretty much ANY modern mirrorless camera with a simple $15-40 adapter. No optics needed, just a metal ring! M42 to Sony E-mount, M42 to Leica L-mount, M42 to Canon RF, M42 to Nikon Z—adapters exist for everything. I'm using a $25 M42 to L-mount adapter on my Leica SL2 and it works perfectly. This makes M42 vintage lenses incredibly versatile!
Does the Biotar 58mm work on Leica cameras?
Yes! The Biotar 58mm f/2 uses M42 screw mount, which adapts to Leica L-mount cameras (SL, SL2, SL2-S, CL) with a simple M42 to L-mount adapter. I'm using this lens on my Leica SL2 with a $25 adapter and it works great. You get manual focus only (obviously), and the camera's focus peaking feature makes manual focusing actually easier than it was in the 1960s with optical viewfinders. No autofocus or electronic aperture, but you get genuine Carl Zeiss optics on your Leica for $100-300 instead of thousands!
Is the Biotar 58mm sharp enough for modern high-resolution sensors?
Absolutely! I'm using it on a 47-megapixel Leica SL2 and it's sharp where it matters. At f/2 it's razor sharp in the center with smooth falloff toward the edges (exactly what you want for portraits). Stopped down to f/4 or f/5.6, it's sharp across the entire frame. Sure, a modern $900 Zeiss Batis might be slightly sharper in the absolute corners at 500% zoom, but for real-world photography? The Biotar is more than sharp enough. Look at the sample photos in this review—that's what you get on a modern high-resolution sensor!
What is the adjustable aperture stop on the Biotar?
The Biotar has a unique spring-loaded ring that lets you set a minimum aperture stop. Here's how it works: pull the ring toward the camera (compressing the spring), rotate it to align with your desired aperture, then release. The ring locks in place and prevents the aperture from closing past that point. This was brilliant for manual metering cameras in the 1960s! You'd meter the scene, set the stop to that aperture, then open up to f/2 for composing and focusing with maximum light. When ready to shoot, just spin the aperture ring until it hits the stop—instant correct exposure without looking. Pretty clever mechanical solution!
Is 58mm better than 50mm?
58mm is slightly longer than the standard 50mm focal length. That extra 8mm gives you a bit more compression and working distance, which is nice for portraits. It's still wide enough for general purpose photography and street work, but with slightly more reach than 50mm. Some people find 58mm to be the "perfect" focal length—not quite as wide as 50mm but not as tight as 85mm. It's a Goldilocks focal length! The Biotar was designed as 58mm rather than 50mm for optical reasons related to the double Gauss formula.
Can you use vintage lenses professionally?
Absolutely, if your work allows for manual focus! Many portrait photographers, wedding photographers, and commercial shooters use vintage lenses specifically for the unique rendering they provide. The vintage "look" with its smooth bokeh, slight warm cast, and organic rendering is something clients actually request. Obviously you wouldn't use a manual focus vintage lens for sports or fast-moving subjects, but for portraits, product photography, or artistic work? Vintage lenses are totally viable. Just make sure you test your specific copy thoroughly—condition varies with vintage glass!
How do I know if a vintage Biotar is in good condition?
When buying a used Biotar (or any vintage lens), check for: (1) Clean glass with no fungus, haze, or separation, (2) Smooth focus ring with no grinding or sticking, (3) Aperture blades that open and close properly, (4) No oil on the aperture blades, (5) Clean exterior with no major dents. Hold it up to a light and look through the glass for any issues. Some dust is normal for 60-year-old lenses and won't affect image quality. Fungus, haze, and separated elements are deal-breakers. Always ask for sample photos if buying online!
Should I buy vintage lenses or save for modern lenses?
Both! I use modern lenses for work that requires autofocus and vintage lenses for creative projects where I want character. The Biotar 58mm f/2 costs $100-300, which is pocket change compared to modern Zeiss or Leica lenses. You can build a whole collection of vintage glass (35mm, 50mm, 85mm, 135mm) for less than the cost of one modern premium lens. Start with vintage lenses to learn what focal lengths you love, then invest in modern versions if needed. Or just use vintage glass forever—it genuinely produces beautiful images!
Pros, Cons, and Who Should Buy the Biotar 58mm
So if you are into the vintage glass "look" then I might suggest grabbing one of these old girls if you can find one and adapting it to your mirrorless camera to see what you can get with it. I think you'll be pleasantly surprised!
Here's my bottom line: The Carl Zeiss Jena Biotar 58mm f/2 is a phenomenal example of why vintage lenses are still worth using in 2024. This lens was made 60+ years ago in East Germany, and it still produces sharp, beautiful images with character that modern lenses can't replicate. The fact that you can buy one for $100 to $300 makes it even better!
The mechanical features are genuinely clever. That adjustable aperture stop? Brilliant design from an era before electronic everything. The 330-degree focus throw with close focus priority? Purposeful engineering that still makes sense today. The clickless aperture ring and 15-blade aperture? Features that modern lenses charge hundreds extra for!
Yes, you give up autofocus. Yes, you have to use an adapter. Yes, you won't get EXIF data. But what you gain is access to genuine Carl Zeiss optics with history, character, and exceptional build quality for the price of a cheap modern lens. That's a trade I'll make every time for creative work.
I need to give this lens back to Aaron eventually, but honestly? I might just need to find my own copy. The Biotar has earned a permanent spot in my bag for portrait work and photowalks where I want that vintage rendering. If you see one at a camera show or online for $200 in good condition, grab it! You won't regret it.
Now get your camera out and go take a picture with it!
Support this website by using these affiliate links to shop on Amazon:
Leica M11 Digital Rangefinder Camera
Nikon AF-S FX NIKKOR 105mm f/1.4E ED Lens
Voigtlander Nokton 35mm f/1.4 II
Sandisk 128GB Extreme Pro memory cards
Sigma 65mm f/2.0 Review: 98% of Leica Quality for $700 (L-Mount)
The Goldilocks Focal Length: 65mm sits right between the standard 50mm and the classic portrait 75mm. It's not quite as wide as 50mm (which can be too wide for portraits), and it's not quite as tight as 75mm or 85mm (which can feel too compressed for some situations). It's just right!
So a good friend loaned me his lens. One of my subscribers that I have grown to know over the years offered to send me a couple of his Sigma lenses and let me use them for a while as review samples for you guys.
The Sigma 65mm f/2.0 mounted on my Leica SL2. You can see the physical aperture ring with 1/3 stop detents (one of my favorite features!). The lens is compact, well-made, and delivers 98% of Leica glass quality for $699 instead of $5,000!
Technical Specifications and Pricing
Before we dive deeper, here are the specs for the Sigma 65mm f/2.0 DG DN:
Optical Design:
Focal length: 65mm
Maximum aperture: f/2.0
Minimum aperture: f/22
Aperture blades: 9 (rounded for smooth bokeh)
Optical design: 14 elements in 11 groups
Physical Specs:
Mount: L-mount (Leica SL/CL, Panasonic S-series)
Filter size: 62mm
Length: 2.8 inches (72mm)
Weight: 14.3 oz (405g)
Minimum focus distance: 21.7 inches (55cm)
Construction:
All-metal barrel
Weather-resistant construction
Aperture ring with 1/3 stop detents
AF/MF switch on lens barrel
Smooth focus ring (encoder design)
Price:
Sigma 65mm f/2.0 DG DN: ~$699
Leica APO-Summicron-SL 75mm f/2 ASPH: ~$4,995
Yeah, you read that right. The Leica costs seven times more than the Sigma. And yet, as I'll explain, the Sigma delivers 98% of the image quality! Let's dig into that comparison.
Why 65mm? The Perfect In-Between Focal Length
If you're not familiar with 65mm as a focal length, let me explain why this is such a sweet spot:
The Goldilocks Focal Length: 65mm sits right between the standard 50mm and the classic portrait 75mm. It's not quite as wide as 50mm (which can be too wide for portraits), and it's not quite as tight as 75mm or 85mm (which can feel too compressed for some situations). It's just right!
Perfect for Portraits: At 65mm, you get flattering compression for portraits without being so tight that you're standing way back from your subject. The working distance is comfortable, and the perspective is naturally flattering for faces. This is actually very close to what the classic 75mm Summilux or 85mm portrait lenses give you, but slightly more versatile.
Great for Street Photography: For street work, 65mm gives you enough reach to pick out details and compress scenes without being so long that you can't work in tighter spaces. I love using this focal length for environmental portraits on the street where I want the subject to stand out but still have context.
Comparison to Other Focal Lengths:
50mm: Wider, more environmental, great for general use but can be too wide for portraits
65mm: Perfect balance, flattering for portraits, good for street, versatile!
75mm/85mm: Tighter compression, classic portrait lenses but less versatile for general use
90mm: Even tighter, requires more working distance, more specialized
The 65mm focal length is honestly underrated. It's not as common as 50mm or 85mm, but once you use it, you understand why it's special!
I really appreciate your offer Hassan and look forward to the day when we finally get to link up and go out on a photowalk together!
Hassan packed up two of his beautiful Sigma primes and sent them up for a look. He sent his 65mm f2 DG DN and his 90mm f2.8 DG DN. Both of these are in Leica’s L mount as Hassan has a Panasonic Lumix camera that is also in L mount due to the L mount alliance between Leica, Sigma and Panasonic.
The first impression of this lens is the darn thing is tiny. This lens is really small, this is awesome as it means it makes the system really compact. The next thing I noticed right away is how nice the build is, all metal construction for the major parts, including the lens hood from what I can tell. Really nice fitment of the lens components so there really is no play in the mating parts. Parts designed to move, like the aperture ring, move only in the direction they are designed to move in. The machine work and fitment is nicely executed from what I can tell.
The next thing I noticed is how fast the focus works, just understand this…it is fast. How fast? Well, it is fast enough to get the shot for me. it is not as fast as my native Leica glass, but it is plenty fast enough for my personal use. I don’t have a way to measure the focus speed, but it works great and I have no complaints about it.
Sample Photos: What This Lens Can Do
Let me show you what this lens actually produces in real-world use. This is shot with the Sigma 65mm f/2.0 on my Leica SL2 during a photowalk around Chattanooga:
Panning blur shot of bicycle riders at Coolidge Park in Chattanooga. This demonstrates how fast and accurate the Sigma 65mm autofocus is! Catching moving subjects with motion blur requires precise focus while panning, and the lens handled it perfectly.
This photowalk sample shows what I meant by "98% of Leica glass." Look at the sharpness, the rendering, the color! This is what you're getting for $699. Not "budget lens performance." This is legitimate high-quality glass that happens to cost seven times less than the Leica equivalent.
The compact size of this lens means I actually carry it more often than I would a bigger, heavier lens. And the 65mm focal length is just perfect for the kind of environmental portraits and street photography I love to do around Chattanooga.
Sigma vs Leica: 98% of the Quality at 14% of the Price
Let me be really clear about something: I said this lens is 98% of my Leica glass in every conceivable way. That's not marketing speak. That's my honest assessment after using both extensively.
The Price Difference is Staggering:
Sigma 65mm f/2.0 DG DN: $699
Leica APO-Summicron-SL 75mm f/2 ASPH: $4,995
That's a $4,296 difference. The Sigma costs 14% of what the Leica costs. Let me repeat that: you're paying seven times less for the Sigma!
What Does the Leica Give You?
APO designation (apochromatic correction for minimal chromatic aberration)
10mm longer focal length (75mm vs 65mm)
Probably slightly better micro-contrast and "Leica rendering"
Full weather sealing
Leica red dot (if that matters to you)
Possibly marginally sharper in the absolute corners (maybe?)
What Does the Sigma Give You?
98% of the image quality for $699 instead of $5,000
Still laser sharp with wonderful rendering
Physical aperture ring with detents (Leica's is clickless)
Compact and lightweight
Weather-resistant construction
You save $4,296 that you can spend on other lenses or, you know, rent!
The "You Couldn't Tell" Challenge: I said you wouldn't be able to tell if I showed you two photos and asked which came from which lens. I stand by that! The Sigma produces images that are sharp, well-rendered, with beautiful colors and smooth bokeh. Unless you're pixel-peeping at 500% zoom in the corners, you're not going to see a meaningful difference in real-world photography.
My Take: If you're a professional portrait photographer who needs the absolute best optical performance and has paying clients who justify the expense? Maybe the Leica makes sense. But for 99% of photographers, including serious enthusiasts and working pros, the Sigma 65mm f/2 is the smarter choice. I'd rather have the Sigma 65mm, 35mm, and 90mm for the price of one Leica 75mm!
The Sigma isn't "almost as good as Leica." It's "actually just as good for any practical purpose, and you save $4,300."
The Sigma 65mm f/2.0 mounted on my Leica SL2 with the aperture ring showing the 1/3 stop detents (one of my favorite features!). The lens is compact, well-made, and delivers 98% of Leica glass quality for $699 instead of $5,000!
Another thing I want to mention here is that the interaction with the lens is different than my Leica glass. Sigma approaches the aperture and the manual focus modes differently that Leica. I will be honest here, I kinda like the Sigma approach to aperture better too. The Leica lens is all software controlled, there are no external controls on Leica L mount glass except for the focus ring, so you use the camera’s controls to adjust everything. On the Sigma, the aperture control is on the lens, which is nice in my opinion. It has aperture choices in 1/3 stop clicks from f2 to f22 and then you can roll the aperture ring around to “A” for auto mode and the camera now has full control of the aperture just like the SL primes.
The manual /. auto focus switch is not one of my favorite features, but it works none the less.
The other thing that Sigma does is something I am on the fence about. The manual focus is a switch selection on the lens itself. I dont know why they chose this way to control this function and to be honest, it is not my favorite way of doing this function. It might be that Leica’s firmware prevents Sigma from exploiting manual focus without it. I really don’t know why, but the focus ring is an encoder design which means it is not mechanically connected to the focus helicoid in the lens. One would think this would be how it would be designed if there was a mechanical switch separating the two modes. All that to say my thoughts of this lens are that it is a great lens, especially for the money and you can get them about anywhere. Well done Sigma, well done.
Pros, Cons, and Who Should Buy the Sigma 65mm
Let me break down the good and the not-so-good about this lens:
What I Love (Pros):
Image quality is 98% of Leica: Laser sharp, wonderful rendering, you couldn't tell the difference
Compact size: "Darn thing is tiny" makes the system really portable
Aperture ring with detents: I prefer this over Leica's all-software control
All-metal construction: Feels solid and well-made
Price: $699 vs $4,995 for the Leica equivalent (seven times less!)
Fast autofocus: Fast enough for real use, no complaints
Build quality: Nice fitment, no play in parts, professional feel
65mm focal length: Perfect sweet spot between 50mm and 75mm
What I Don't Love (Cons):
AF/MF switch on lens: I'm on the fence about this vs Leica's software-only approach
Slightly slower AF than native Leica: Not as fast as Leica glass (but still plenty fast!)
Focus ring is encoder design: Not mechanically connected to focus helicoid
No dedicated "Art" line features: This is the DG DN "Contemporary" line, not Art
Who Should Buy This Lens:
Leica SL2 or Panasonic S-series shooters on a budget
Portrait photographers who want 65mm/75mm without spending $5,000
Street photographers who love the 65mm focal length
Anyone building an L-mount kit and prioritizing value over badge
Photographers who appreciate physical aperture rings
People who want Leica-quality images without Leica prices
Who Should Skip This Lens:
People who absolutely need the fastest autofocus for sports
Photographers who already own the Leica 75mm f/2 (obviously!)
Anyone who values brand prestige over practical performance
People who need weather sealing for extreme conditions (Sigma is weather-resistant, not fully sealed like Leica)
Frequently Asked Questions About the Sigma 65mm f/2.0 DG DN
Is the Sigma 65mm f/2.0 really 98% as good as Leica glass?
Yes! I said it in the review and I stand by it: this lens is 98% of my Leica glass in every conceivable way. The images are laser sharp, the rendering is wonderful, and if I showed you two photos (one from Sigma, one from Leica) you would not be able to tell which is which. The Sigma 65mm f/2 costs $699 versus $4,995 for the Leica APO-Summicron-SL 75mm f/2. You're getting 98% of the performance at 14% of the price. Unless you're pixel-peeping at 500% zoom, the practical difference is negligible!
Does the Sigma 65mm work with Leica SL2?
Absolutely! The Sigma 65mm f/2.0 DG DN is made specifically for L-mount, which includes Leica SL, SL2, SL2-S, CL, and Panasonic S-series cameras. It's a native L-mount lens with full electronic communication, autofocus, and image stabilization support. No adapter needed. I've been using it on my Leica SL2 and it works perfectly. This is one of the best third-party options for Leica shooters who want to save money without compromising image quality!
Why 65mm instead of 50mm or 75mm?
65mm is the perfect in-between focal length! It sits right between the standard 50mm and the classic portrait 75mm. At 65mm, you get flattering compression for portraits without being so tight that you need tons of working distance. For street photography, it gives you enough reach to compress scenes without being too long for tighter spaces. Think of it as a Goldilocks focal length: not too wide like 50mm, not too tight like 85mm, just right! Once you use 65mm, you'll understand why it's special.
How is the Sigma 65mm autofocus speed?
The autofocus is fast! I said in the review "it is fast enough to get the shot for me." It's not quite as fast as my native Leica glass, but it's plenty fast for portraits, street photography, and general use. I was able to shoot panning blur photos of passing bicycle riders at Coolidge Park with no issues. For sports or action where you need the absolute fastest AF, native Leica might be marginally better, but for 95% of photography? The Sigma is more than fast enough!
What's the difference between Sigma Contemporary and Art lenses?
The Sigma 65mm f/2.0 DG DN is part of Sigma's "Contemporary" line, which focuses on compact size and portability while maintaining excellent optical quality. The "Art" line prioritizes ultimate optical performance over size and weight. For the 65mm, Sigma chose the Contemporary designation, which makes sense because this lens is genuinely tiny and lightweight. You're not giving up meaningful image quality by getting Contemporary instead of Art. This lens punches way above its weight!
Does the Sigma 65mm have an aperture ring?
Yes, and it's one of my favorite features! The aperture ring has 1/3 stop detents from f/2 to f/22, giving you tactile feedback and precise manual control. If you prefer camera-controlled aperture, just turn the ring to "A" for auto mode. I actually prefer Sigma's physical aperture ring approach over Leica's all-software control. It's faster to adjust and you get physical feedback. The Leica SL lenses don't have aperture rings at all, it's all done through camera menus!
Is the Sigma 65mm sharp?
Laser sharp! I said it in the review and the sample photos prove it. The Sigma 65mm f/2.0 is sharp wide open at f/2, and stopped down to f/4 or f/5.6 it's incredibly sharp across the entire frame. The rendering is wonderful, colors are accurate, and the 9-blade aperture creates smooth bokeh. If you compare it to the $5,000 Leica 75mm f/2 at pixel-level, you might find minor differences in the absolute corners. But for real-world photography? You won't see a difference. This lens is sharp enough for any professional application!
Should I buy the Sigma 65mm or save up for the Leica 75mm?
Buy the Sigma unless you have $4,300 burning a hole in your pocket! The Leica APO-Summicron-SL 75mm f/2 costs $4,995. The Sigma costs $699. That's a $4,296 difference! With that money saved, you could buy the Sigma 65mm, 35mm, and 90mm, giving you a complete prime lens kit for less than the cost of one Leica lens. The Leica is objectively excellent, but the Sigma is subjectively smarter for most photographers. Only buy the Leica if you're a working pro who needs that last 2% of performance for paid work, or if you just really want that red dot!
How compact is the Sigma 65mm?
It's tiny! I said "the darn thing is tiny" in the review because it genuinely surprised me. At 2.8 inches long and 14.3 ounces, it's significantly more compact than comparable lenses. This makes the system really portable, which is important for Leica SL2 shooters who value compact systems. The all-metal construction means it still feels substantial and well-made despite the small size. It's the perfect travel lens because it doesn't weigh down your bag!
What's the AF/MF switch issue you mentioned?
The Sigma has a physical AF/MF switch on the lens barrel, which means you have to switch the lens to AF mode, then use the camera menu to select which AF mode you want. Leica lenses do everything in software with one step. The Sigma approach works fine, it's just a two-step process that feels slightly clumsy compared to Leica's one-step software control. I said I'm "on the fence" about it because it works, but Leica's approach is more elegant. It's a minor user interface quirk, not a deal-breaker!
Pros, Cons, and Who Should Buy the Sigma 65mm
Thank you for reading my thoughts on the Sigma 65mm f2 DG DN lens that Hassan loaned me for my Leica SL2. It has been an adventure for me.
Here's my bottom line: The Sigma 65mm f/2.0 DG DN is 98% of Leica glass quality at 14% of the price. That's not hyperbole. That's my honest assessment after extensive use.
Hassan, thank you for trusting me with your beautiful lenses! This 65mm has honestly made me reconsider my lens buying strategy. Why am I spending $5,000 per Leica lens when Sigma is producing glass this good for $700? The practical performance difference is negligible for the kind of photography I do.
The only real downside is the AF/MF switch on the lens, which feels slightly clumsy compared to Leica's software-only approach. But that's a minor user interface quibble, not a deal breaker. The image quality, build, size, and price make this lens a no brainer for L mount shooters.
If you're shooting Leica SL2 or Panasonic S series and want excellent 65mm performance without spending $5,000, this is your lens. Period. Sigma has seriously stepped up their game with these DG DN mirrorless lenses. They're not just "good for the price." They're genuinely excellent, full stop.
I look forward to the day when Hassan and I can finally link up and go out on a photowalk together! Maybe by then I'll have bought my own copy of this lens because honestly? It's earned a permanent spot in my bag…or should I say “on my shelf” lol.
Now get your camera out and go take a picture with it!
Support this website by using these affiliate links to shop on Amazon:
Sigma 65mm f2.0 DG DN Lens L mount
Nikon AF-S FX NIKKOR 105mm f/1.4E ED Lens
Voigtlander Nokton 35mm f/1.4 II
Sandisk 128GB Extreme Pro memory cards