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canon EF 40/2,8 pancake
it's not perfect but it does what it is supposed to do perfectly
sharp wide open in the center, 2,8 is fast enough for steeet/docu shots and with how tiny optics are it's impressive. the vignette is significant but very soft and pleasant to the point that I don't auto correct for it. most important of all, barely bigger than a body cap, with 6d it's a pocket setup (if your coat has non-euclidian pockets)