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Message: <blockquote data-quote="STM" data-source="post: 125628" data-attributes="member: 12827">Only if the camera has an aperture transmitting tab on a ring which goes around the lens mount. For cameras which lack this ring, mounting a non-AI lens will not hurt anything. On the F3 and F4 (pictured below) as well as the Nikkormat FT2/3 and Nikkormat EL, you could actually flip that little tab up out of the way so you could mount a non-AI lens without fear of damaging anything. The little button to the right of the tab is used to unlock the tab so you can flip it up. Honestly, I wish Nikon still did this with their digital cameras which still have that tab. Honestly, how much would it add to the cost of the camera? A couple of bucks?<img src="http://www.nicovandijk.net/AItab.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>