35mm f/1.2 V.S. 85mm f/1.2L

anorphirith

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It's comparing apples and oranges isn't it? But I do like these kind of questions. I just tend to think: what would I rather own or use? I had a T90 for a while with a 85/1.2L in FD mount, but I didn't like the soft portrait rendering at f/1.2. Compared to my contax G lenses it just didn't seem sharp at all! It's unfair off course to compare such a fast lens at it's maximum aperture to a slower lens at it's maximum aperture, but I kept the gear I liked best. I make better portraits with a 135/2.8 for some reason.
If you are mostly interested in 'available darkness' photography, there are some points on which one can compare the two lenses. I would go for the 35/1.2 on the leica because it allows for longer shutter times because of the lack of mirror slap and the shorter focal length. Also it has more depth of field than the 85/1.2. The 85/1.2 at short distances doesn't even allow for the focus-recompose technique. The depth of field is too small; once you recompose, focus is off.
I think you could shoot the 85/1.2 at 1/60 of a second at f/1.2. That would be your maximum low light ability with that lens, if you have a steady hand. I would rather shoot a fixed lens rangefinder with a leaf shutter at 1/15 of a second at f/2.5. it would give me the same low light ability, more depth of field, and better performance optically. In fact, if you shoot leica, why not use a 35/2 summicron? I'm sure it's better corrected than the 35/1.2. Do you really need a 35/1.2 and super fast film like delta 3200? To me, superfast lenses are a compromise on performance. I like the crispness of their slower siblings
 
I own them both... they are different tools for different purposes; horses for courses and all that. A 35 f/1.2 will let you pull more light in in absolute terms, especially on a rangefinder; on the other hand a digiCanon at 3200+ ISO will eat colour film alive when it comes to IQ at similar ISO. Not to mention the very different framing options and working distance involved in a 35mm versus 85mm 🙂

That said... the CV is a lot less scary than the Canon cyclops! Although I must add that I pulled out a loaner 200mm f/1.8L at a company event once; hilarity ensued. _That_ is a front element!
 
A few years ago when I owned a 20D. Before selling it and all my canon lenses to pay for my M8. I had the original 85 f1.2. It was slow and heavy but it produced amazing images when everything worked out just right.
 
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