Fred Miranda
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So, my CV 15/4.5 III E-mount replacement seems to perform well. (light-years from my previous copies towards the corners)
I compared it directly to "Choppy" using the same framing and lighting.
The CV 15/4.5 III has a minimum field curvature but it can be seen at f/4.5. It's outwards, meaning, the center plane is slightly further from the edges. At f/5.6 and especially f/8, this is pretty much unnoticeable, being masked by DOF.
About Choppy:
Choppy is well-centered and its true infinity is a tad before the infinity hard stop (for the corners).
About my second E-mount version:
It's also well-centered but its true infinity is at the hard stop. (moving away from the hard stop does not improve the extreme edges from my focus bracketing tests)
Both lenses look pretty much identical at center and mid-field areas.
Here is a comparison between both lenses at f/8 for the extreme edges only.
I did not apply any extra sharpening, so this is LR default (25, 1, 25, 0). I didn't want to increase noise which could be perceived as extra detail. Adding my LR sharpening improved the edges considerably but for this comparison I wanted to keep things as unprocessed as possible.
There were NO lens profile correction applied in-camera nor Lightroom. So both crops show extreme corners uncorrected. It's interesting to notice that the E-mount version does show the same level of LaCA which is more evident on Choppy's. This is interesting since all corrections were OFF in-camera and Lightroom. Perhaps something is being done automatically to the RAW file....or there is actually an improvement...not sure yet)
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