It is a Nikon D7200 camera, with a Sigma 70-200mm f/2.8 APO EX DG OS. Is this lens incompatible with my camera or am I just attaching the lens wrong? The lens looks too big for the camera body. Thanks!
Added (1). I feel silly now. It turns out the person who bought me the lens bought me one for a Canon camera!
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Am I putting my new lens on my DSLR wrong?