Question about Nikon 20MM F2.8 AF NIKKOR Lens
Sounds like the AI ridge on the aperture ring may be slightly damaged. The D200 senses when the lens is set at minimum aperture using that ridge. The AI ridge is the raised part on the back edge of the aperture ring. On that lens, the contact edge is between f/11 and f/16, closer to the 16. Look closely at that edge, it should be smooth with even corners. Since it works a bit if you jiggle the ring, it sounds like maybe just a little piece missing. If it's damaged, replacement is pretty your only option.
Posted on Feb 07, 2009
With the lens off, look at the camera mount area. If you are looking straight at the mount, there is a small tab sticking out at about 7oclock on the outside edge of the mount ring. The tab is spring loaded and may be damaged. You should be able to push the tab toward the base of the camera and it will snap back if functioning properly. If it feels loose or doesn't spring back, then switch that ab controls is not being activated.
Posted on Dec 23, 2007
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Posted on Jan 02, 2017
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