Tab on D5100 lens mount

Started Oct 26, 2012 | Discussions thread
just Tony
Contributing MemberPosts: 849Gear list
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Aperture ring position sensing
In reply to leoda, Oct 26, 2012

On AF lenses that are not the AF-S type there is a matching tab on the aperture ring. The camera body requires the lens to be stopped down and the tab is the sensing switch that confirms it. If you unlock the ring and move it to a more wide open position the camera displays an error message and won't shoot.

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Nikon D800 Nikon D810 Nikon AF-S Nikkor 16-35mm f/4G ED VR Nikon AF-S Nikkor 300mm f/2.8G ED VR II Nikon PC-E Micro-Nikkor 85mm f/2.8D +3 more
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