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发表于 2018-4-5 23:07
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This is the Ukrainian 45mm lens that you are most likely to find available for sale. At the maximum aperture of f/3.5, the Mir-26B produced an image that was only sharp in the very centre. This is not just the effects of depth of field. The shop sign “Visions”, about one third in from the left and exactly half way down the frame, is quite fuzzy. At f/11 we benefit not only from increased depth of field; the whole image sharpens up tremendously.This lens suffers from slight barrel distortion at the edges. In many shots – including this one – that distortion is not noticeable, but sometimes it can be seen
45 lp/mm in the centre and 16 lp/mm in the corners for the Mir-26
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