Question about Tamron 28-200mm f/3.8-5.6 LD Aspherical IF Super II Macro Autofocus Lens for Minolta

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AF not working

On my Sigma Aspherical IF 28-200 mm lens the autofocus will not work! When i connect it to my camera it makes this grinding/clicking noise like its trying to work but about 15 sec into it the camera switches to manual. I can focus it manually but it gets stuck! and i do not want to force it and harm the lens any more! when i take the lens of the focus moves fine but i noticed that the little screw looking thing that connects to the camera witch is how it focuses will only turn when i focus in word and will jump occasionally when focusing out!

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Try cleaning the sensors in front of the camera.

If you still get the problem it is an internal fault, probably the autofocus optic sensors are not working.

The motor used by autofocus is same as manual focus, therefore the problem is on sensors, wirings or logic board.

The repair involves taking apart the camera completely and testing components and parts.

Posted on Jan 10, 2009

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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.

Posted on Jan 10, 2009

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Open the lens unit completely and clean it properly.its stuck up completely.clean it to solve this problem.

Posted on Jan 10, 2009

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Sigma 28-300mm f/3.5-6.3 DL Aspherical IF Hyperzoom Autofocus Lens for canon slr compatible with Canon t3i dslr


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Can I buy an adapter to use the 28-200 mm Sigma Aspherical lens fitted to my Pentax MZ-50 film camera on my Canon EOS 1000d DSLR. Would it work?


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Nikon d40 wont autofocus


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