Question about Nikon 20MM F2.8 AF NIKKOR Lens

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Repairing 20mm af nikon lens diaphragm lock

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!

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  • Kibo Dec 23, 2007

    Thanks for the reply - The lens works on a D200 & F100, but not a D100. So I guess it is not the lens. But the lever you describe seems to be working fine on the 100.



    Appreciate your help,

    Kibo

  • Kibo Dec 23, 2007

    This is the only lens (7) I have that doesn't work on the D100. I also have a 50mm same vintage and type and it works fine. I've checked and cleaned everything I can find on the 100 and the lens. Thanks for the suggestions! I have a feeling that it may be the diaphraghm activeation lever on the body or lens that aren't alligned correctly.
    Kibo

  • Anonymous Mar 27, 2014

    is it compatable with the Tamron 18-270mm f/3.5-6.3 Di II VC PZD AF Lens

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  • Expert
  • 48 Answers

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

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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

  • Kevin Pettit
    Kevin Pettit Dec 23, 2007

    Ok, try another lens just to make sure. The D100 may have dirty contacts at the top of the mount area. Make sure the pins on the lens connector are springy and clean on the 20mm

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Hi Kathy,

Are you ready?

1. Make sure the Nikon SC-29's Red Panel's Lock Switch is set to the Left. Pointing at Left Black Screw.
2. Connect the Nikon SC-29's (Red Panel) to your camera's Hotshoe by pushing it as far as it goes.
3. Turn Lock Switch to the Right (turn CW). This locks down to camera.
4. Make sure Nikon SC-29 (other ends) AF-ILL is set to OFF.
5. Make sure your Nikon SB-800's Lock Switch is set to the left side.
6. Attach your Nikon SB-800 into this Hotshoe.
7. Switch the Lock Switch on flash to the right.
8. When you wants to AF from flash, set AF-ILL to "OFF"
9. For the best results, set AF-ILL to "ON".

I teaches, do repairs, services and modifications on all photographic equipments.

I hope they are helpful to you as well as for any Nikon Photographers using the Nikon SC-29 Cable.

Mine has Autofocus, ITTL, Slave and Wireless Radio Remote Flash.

Truly,
atdlee@netzero.com

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izzy41,
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randy320sgi

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