Fred Miranda
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Nifty Fifty wrote:
I love my Nokton 1.2/50 SE, but I've noticed that I almost only use the 1.2/50 GM because taking photos with autofocus is so much more relaxed. I'm actually considering selling the SE version and getting a version for M-Mount and the Techart adapter for my A7iv instead. This swap would obviously mean losing a lot of money, because I bought the SE version new last spring. But that's my problem. The question I want to ask here is how accurate and reliable the AF works with the Nokton 1.2/50 (or 1.2/40) with Sony, even if the subject is not centered. I don't think the image quality itself will be noticeably worse, right? I'm not a pixel peeper.
Does anyone have experiences they would like to share?...Show more →
Because the Sony A7 IV has a thicker sensor stack, the field curvature shape changes when using the CV 50mm f/1.2 on this camera. The curvature becomes more outward, causing the mid-zone and corners to be out of focus when focusing on a subject at the center:
https://www.fredmiranda.com/forum/topic/1561782/32#15316872
That's a consideration, but it also affects the out-of-focus rendering when shooting at wide apertures due to the more extreme curvature. This means that areas that should be out of focus may appear sharper (more in focus). This is more prominent when focusing on subjects at mid-distance, where blur does not mask these ill effects.
Other than that, the lens should perform the same as the E-version.
Regarding the LM-EA9 AF adapter, it works best when focusing around the center of the frame. When focusing outside of the center, sometimes focus is not possible, but that depends on the lens. Some lenses focus right to the corners, while others don't. The adapter also performs better with newer cameras like the A7CR and A7RV, benefiting from the improved AF tracking of these cameras.
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