- Aug 16, 2012
The x-axis is in standard deviations from the mean. I'll take a bet that the Canon standard deviations are much less than the Chinese knock-offs and most will be within spec. But some of those knock offs that are not even outliers will cause problems. There was post that 20µ difference could be noticeable but I am not going to hunt through the posts for it.All adapters will affect the mounting of a lens on one body relative to how it would mount to another.
Most combinations will be acceptable for photography. Those which are not are outliers. That said, I wouldn’t be surprised if the current eos r cameras have AFMA but that it’s not user accessible. View attachment 185243