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Can someone tell me what this missing screw is for?
Can someone tell me what this missing screw is for? I just bought a lens off ebay (Canon EF 135mm F2 L USM). All the optics were super clear and no other apparent issues upon inspection. I happened to notice though it was missing a screw (see picture). Any idea what these screws are for and any potential issue (aside from dust moisture etc) with it being open like that? Thankfully I have an asso...
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