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.
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.
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 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 thr 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.
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.
So in conclusion, if you want great glass at a fraction of the cost of Leica, these lenses are 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. Now get your camera out and go take a picture with it.