Steve Spencer wrote: j4nu wrote: snapsy wrote:
Nikon's MF assist on the MILC uses the same phase-detect focus sensing mechanism that's used by the camera's AF system, so the green box confirmation for MF is as precise as if you used autofocus on the subject. In other words, very good. It's also why the feature is only available for lenses with electrical contacts (or adapters that simulate them), since the sensing mechanism needs knowledge of the lens's exit pupil distance in order to properly evaluate the focus phase.
Are you sure about that exit pupil distance?
Some "dumb" VM lenses work with focus confirmation via a "smart" adapter, but the adapter doesn't know anything about the lens it's attached to I'd think...
I think the "smart," adapter is telling the camera that it is a lens which it actually isn't. If it has a similar exit pupil that may not matter, but if the exit pupil is quite different I suppose there is potential to mess up the focus confirmation.
Indeed, that makes sense... but that would also mean exit pupil information is not crucial to the accuracy of focus this way ...
Oct 22, 2024 at 01:24 AM
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