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Message: <blockquote data-quote="nickt" data-source="post: 594857" data-attributes="member: 4923">Here is a random lens I googled. <a href="http://www.momentcorp.com/review/nikon-10.5mm-fisheye-nikkor-2.8.html" target="_blank">Nikon 10.5mm DX Fisheye Review</a>Scroll down the page and look at the mount with the red arrow pointing to a screw. If a lens has that screw, it will not autofocus on your camera. Check your 50mm lens. It will not have that screw. Lack of that screw means the lens has a built in motor.In the past, the focus motor was in the camera body. It drove the lens through that screw. Then they moved the motor to the lens and made lower cost bodies without motors. The higher end bodies still have a motor and they can use either style lens. So if a lens has that drive screw, it is an older lens that needs camera drive and it wont auto focus on your model.</blockquote>