04-23-2011, 09:46 PM
Actually, the greatets lenses available for FF are sharpest at around F/4, when resolution is diffraction limited. This means that for APS-C, you need to look for lenses that are sharpest at arounf F/2.3 or thereabouts, as that is where they hav ethe potential to be equally sharp at images of the saem size.
However, as others already indicated, this is totally meaningless. Often we want to stop down further, or less, because that is the image we want to create, or we want to use a specific lens for the special way it renders under certain circumstances. And it may well be that that is not at its sharpest aperture either.
HTH, kind regards, Wim
However, as others already indicated, this is totally meaningless. Often we want to stop down further, or less, because that is the image we want to create, or we want to use a specific lens for the special way it renders under certain circumstances. And it may well be that that is not at its sharpest aperture either.
HTH, kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....