| http://www.w3.org/ns/prov#value | - Open the aperture to its widest setting and hold it up to a light to look for fungus on the internal glass elements. (A few dust specks are normal and will not affect image quality.)Make sure there are no screws missing. (This could mean that someone other than an expert had taken it apart and fiddled around with things inside.)Make sure the lens comes with BOTH lens caps.
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