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Message: <blockquote data-quote="Brian k0efj" data-source="post: 389139" data-attributes="member: 35382"><p>I have a nearly new D7100 that I have taken many photos with using my sigma 70x200.  Recently it took a notion not to auto focus or become erratic in auto focus and shutter release.  Other lens that I put on the camera work fine. So I decided the lens HSM is prob bad and send it in for repair.  I have a friend that is a Professional Photographer so He loans me his Sigma 70x200. Had same issue. :nightmare:   Again all other lens work fine.  So I went back to my friend he puts his sigma on his D700 works fine. :hurt:  Pulls his Tamron 70x200 puts on my body works fine.  Switches his lens back to my body no work. I put another lens back on works fine. I have reset camera. Battery fully charged. Any Idea's??  Thanks for your help</p></blockquote><p></p>