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AF is not working

I use AF-S Micro Nikkor 105mm 1:2.8 G ED for Nikkon F5 camera but recently the AF is not working at all. I wonder if anyone knows how to fix the problem. Thank you and God bless.

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I would start to diagnosis the problem as follows: When the lens functions properly and is on the camera, the lens aperture is forced wide open by a pin on the camera body pushing a lever on the lens that opens the aperture. As part of the sequence when you push the shutter button, the camera releases its pressure on the spring-loaded lever on the lens, allowing the aperture to close to the setting that the "computer" has determined as correct. You will find this lever on the outside of the black ring that surrounds the rear lens element. With the lens removed, find the lever and make sure that with the lens set to the smallest f-stop (largest number such as f22), sliding the lever counter-clockwise against the slight spring tension, the aperture opens wide and returns to f22 when released. If this is not the case, the problem is in the lens. If this works, then the problem is either in your camera body or in the alignment between the body and lens. Also, the electrical connection between the camera body and the lens is via the five little ball like metal contacts (4 together and one wider spaced) found on the black ring on which the aperture ring is located. If either these contacts or the contacts on the camera body are dirty, the automatic functions may fail. DO NOT use any liquid cleaner. Gently rub the contacts with a rubber pencil eraser, being very careful to hold the camera body or lens in a position that will allow any debris to fall downward away from the body or lens. Do not overdo it. If this does not get you on the right track, let me know what you find and we will proceed from there.

P.S.: Have you made sure you have fresh batteries in the camera?

Posted on Nov 28, 2008

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Putting it back together


In 1965 I did the same thing with a Nikon single focal length lens my F Photomic. This lens was far more simple then a modern AF zoom lens. I had to bite the bullet and pay a camera repair man to fix the lens. He told me that had I not tried to fix the lens myself, the repair would have cost 1/4. The only answer to your question is to take it to a camera repair man and get a quote. I would check the quote against the price of your lens on E-bay and use that to determine if you want to fix your lens or replace it.

By the way, it is very rare for dirt between elements to be so problematic that it results in a degradation of picture quality.

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