philber wrote:
AmI wrong in wondering whether out-of-focus is the same as smearing? IN my experience, among others with NEX 5, which did smear corners with quite a few lenses, never did the result look like those of a lens with field curvature and misfocused corners. So why am I reading so many comments about FC and mis-focused corners? Am I missing something?
To be honest, it doesn\'t really matter, whether the corner softness is caused by smearing or glass cover induced exaggerated field curvature, as the end result still remains soft corners. My thinking is that smearing and exaggerated FC are both caused by the glass cover but are two separate phenomenons. Smearing is caused by coma, exaggerated FC is caused by the changing of the focusing plane as the light rays enter the glass at a steep angle. The reason why you didn\'t see much FC on the Nex 5 is because you are using the sweet spot of the lens that is normally quite flat field, which leaves the other aberration to be seen. Just my educated guess as I have not used the Nex 5 with alt glass.
Nov 20, 2013 at 01:56 PM
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