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.

Sigma 65mm f2.0 DG DN lens mounted on Leica SL2 L-mount showing aperture ring compact size — 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 motion blur bicycle riders Coolidge Park Chattanooga shot with Sigma 65mm f2.0 autofocus speed — 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. 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! — 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 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!