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why did the corners of my 20mm af-d 2.8 suddenly turn really bad?
it used to be pretty good some days ago but now it's just super bad(so bad that when I downscale it to web sizes it still looks bad, corner sharpness loss is even visible on APS-C now), even with manual focus I can't get a single point where the corners are good.
I usually keep this lens in my pocket but I haven't bumped it into something, think one of the elements are misaligned or something?