Stafford wrote:
I put a Sigma 70-200 APO DG on my Nikon D7100, it would not autofocus, then put the lens on a D90 and it would autofocus. I have a Sigma 18-35 that I use most of the time on the Nikon D7100 and D90. I can use a Nikon 70-200 on both cameras with out any problems. The Sigma 70-200 works fine on a D700 or D750. Any suggestions?