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Steve Spencer wrote:
Looking at all the CV 35mm lenses for Leica M mount it is amazing that all have a purpose and a place, but none stand out for me as the lens I want. Here is the run down as I see it:
CV 35 f/1.2 III Nokton- nice sharpness with quite nice bokeh, not bad axial CA correction especially as you stop down, pretty heavy vignetting which cause extreme cat's eyes, in the end a pretty big lens for me on a Leica M body and comes with quite a bit of finder blockage.
CV 35 f/1.4 classic - lots of SA wide open, quite a bit of axial CA (masked a bit by the SA), bokeh is mixed depending on the situation, not very sharp until well stopped down, lots of vignetting which causes extreme cat's eyes, but very small and ergonomically quite good
CV 35 f/1.5 Nokton - see Fred summary above
CV 35 f/1.7 Ultron - pretty sharp at most distances--less so close up, a bit of axial CA but not too bad, quite nice bokeh but high vignetting leads to some pretty extreme cat's eyes if you have specular highlights, no mid zone dip, quite nice landscape performance stopped down. A big of an ergonomic disaster, however, IMO. Small focus ring that is less than ideal and the lens causes a fair bit of viewfinder blockage.
CV 35 f/2 Ultron - ergonomically very nice, small with a nice focus tab and cause little viewfinder blockage. Optically, not to my taste with bokeh that I see as fairly harsh and quite a bit of axial CA. It is a sharp lens, however.
CV 35 f/2 APO - stunning sharpness, with ok bokeh except in the transition zone. Very little axial CA as would be expected and quite decent performance close up. A lot to like optically, but ergonomically it is quite big with quite a bit of viewfinder blockage.
CV 35 f/2.5 Skopar - a bit of a sleeper lens as ergonomically it is quite good and optically it is generally pretty sharp at most distances. Axial CA is naturally limited by the narrow aperture, but the narrow aperture also means that the quantity of bokeh is often pretty low. What bokeh is there is pretty good, however.
That is a lot of lenses, but each has there plusses and minuses and you can add in Zeiss and Leica lenses and IMO only one lenses doesn't have some significant compromises (the new Leica 35 f/2 APO and that has the obvious compromise of a super high price).
So, 35mm to me is a focal length where you have to pick what compromises matter most to you. I would love a lens like the Leica M 50 f/1.4 Asph with great ergonomics, great sharpness, excellent bokeh, and low CA, but nothing like that exist at 35 (well except perhaps the uber expensive Leica M 35 f/2 APO), so we have lots of choice but for me at least not a lot of satisfaction....Show more →
Solid list Steve. One aspect that rates importantly for many is flare resistance—and there is variability across the lenses.
Also, I am going to run my own formal test, but with both lenses at f2, I have found in real world shooting the CV 35/2 LoCal to be good (not perfect or great), and better than the new CV 35/1.5. I’ll post my results.
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