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some things to look for are that it focuses correctly, no huge dings or dents, no/limited scratches on the lens.
take a few pictures and see if there are any visible dust spots (if your lcd allows that, and assuming your sensor is clean). I also would check "through" the lens (without the lens/rear cap) to make sure there isn't anything funky in the lens.
if it passes all that, you're gold!
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