LBJ2 wrote: Fred Miranda wrote:
I've just tested the CV 75/1.5 Nokton on the Leica M240 and see the exact same field curvature characteristic and shape as I saw on the Sony. The FC is wavy and noticeable. Center and extreme corners are very sharp though. It's a characteristic of the lens and perhaps what allows it to be so compact for a f/1.5 telephoto lens.
There were reports saying it was a more flat field lens on the Leica's thinner sensor but I do not see it...at least not at infinity and mid-distance.
In my view, it's another lens that can be used for both systems. I'm using: CV 12/5.6, CV 21/3.5, CV 35/1.2 III, CV 50/3.5 and CV 75/1.5 on both Sony and Leica.
So glad you got your own copy of the CV 75/1.5...again. I was almost starting to feel guilty
Regarding the noticeable FC with this lens on your M240, please post example when you can. I believe the M240 and M10 share the same sensor so curious as why some reported no FC with this lens on the M10. Also, and since I know my copy is perfectly centered ( thank you Fred) what's an easy way for me to test FC for myself, anything I can do in the house or do I need take a picture of a flat field structure at a greater distance outside? I hate to mention it but I have a big red brick wall I can use as a test subject.
How about infinity focus with your CV 75/1.5 compared to the CV 35/1.2 III?
Either way, an awful lot to like about the CV75/1.5 as has been mentioned.
I am pretty sure the M240 and the M10 do not share the same sensor even though both have 24 MP. They don't share the same DR according to Bill Claff's measurements at photons for photos:
Still I wouldn't expect the cover glass to be too different between the two cameras. If anything I would expect the M10 to have slightly thicker cover glass. That has been the trend from M8 to M9 to M240.
Notice in Bastian's M10 addition to the review at phillipreeve.net, he still sees a midzone dip even on the M10 just that it isn't as extreme.
From looking at the photos there I would say the lens has a similar look on both the Sony and the Leica, and I see only very small differences close up or at portrait differences. In that review where the lens is compared on a Sony A7r II vs. the M10, the lens seems to do a bit better on the Leica than the Sony at infinity focus, but Fred's comparisons are on the higher resolution A7r IV downscaled to 24MP. I suspect that the higher resolution camera basically makes up for the small advantage of the lens on the M10 where the thinner cover glass helps performance. So, I don't think the team at phillipreeve.net and Fred are really seeing anything different. The lens has a similar look and character on both Sony and Leica. The lens performs very similar on both cameras at close focus and portrait differences. The lens is designed for the thinner cover glass, however, and you can see a bit better performance on the Leica at infinity focus, but that advantage is off set if you use the high resolution A7r IV and downscale such that even at infinity focus when comparing the lens on the 24MP M10 to the 61MP 7r IV downscaled the results look pretty close.
Apr 25, 2020 at 09:20 AM
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