I own a sharp and well-centered copy of a Sony 20G f/1.8. I shoot it on an A7rIV but purchased the lens to use on my Z7 as well with a Megadap ETZ21.
The 20G is sharp to the edges wide-open on the A7rIV but is very soft on both edges on the Z7, at least until around f/5.6. I've tried it with two different Megadap adapters and on two different Z7 bodies, so it doesn't appear to be a tilted adapter or camera mount. I've also eliminated Sony lens corrections as the difference by stripping out the Sony correction profile and not observing any difference in the edges (this lens have very little distortion).
I also tried it on a Z6 and see similar softness, although it's less noticeable due to the lower MP.
I don't see this on narrower focal lengths, for example on the 50GM f/1.2
Any ideas? My only guesses are the adapter design, or that the the Sony has offset microlenses to account for the periphery of this lens design but I don't recall ever reading that to be the case.
Feb 08, 2024 at 11:26 AM
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