Question about Nikon 20MM F2.8 AF NIKKOR Lens
The diaphragm lock on my 20mm 2.8 AF Nikon locks but the camera (D100) it's on doesn't see that its locked anymore? HELP!
Since this lens is the only one with a problem, it sounds like the EE tab on the aperture ring is damaged or missing. The EE tab is a small protrusion on the rear edge of the aperture ring at the 4:00 position when you view the lens from the rear with focus index at 12:00 and aperture set to highest number. That EE tab is what pushes the microswitch cammedic mentioned. The D200 recognizes it fine because it doesn't use that EE tab to sense minimum aperture setting, it uses the AI ridge.
Posted on Feb 07, 2009
I'll offer the same answer I just gave on a D200 question: 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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