Question about Sigma 28-105/3.8-5.6 UC III Zoom Lens f/Minolta

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My Sigma 28-105 lens auto focus stopped working

The manual focus is fine. Other auto zoom lenses are working ont he camera (Sony a700) This Sigma just stopped. I wonder if it is something simple like cleaning the contacts on the lens. I assume I could take alchol to them, but maybe not...any suggestions?

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What kind of batteries does it use. Have you checked to see if they are up to the right voltage for use?

Posted on Jan 04, 2009

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I would need more info to help you.

Posted on Jan 04, 2009

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1 Answer

Why does my lens only zoom to 200


Could be, because most camera's only can auto focus till f/1:5.6. And if 5.6 is reached at the focal length of 200 mm, the camera stops it from going to a part it can't be focused.
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Purchase Zoom Lenses


Canon currently makes super Telephoto lenses from 300mm to 800mm and a number of zoom Telephoto lenses from 28-300 to 100-400. You can also special order a 1200mm lens from Canon at a cost of $99k! (There are only about 20 such lenses made so far.)

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Hi    The switch is held on by two screws you can remove the screws    and the switch will fall off it will need cleaning 

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Did it ever work on this camera?
I have seen some Sigma lenses that are auto focus on canon film cameras but then when put on the digital they dont work right. If you have used it on this camera then make sure the lens is clean.sometimes dirt on the front wil make it try focusing on the dirt. Next try focusing in manual focus to make sure the focus is working. Then take the lens off and then put it back on and make sure it clicks into place.

Let me know if none of those things work. also make sure to try focus on something close and somthing far away.

let me know how it works,
Caleb

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1 Answer

Lens


Sorry, the mounts of Minolta manual focus lenses are different than their auto focus series. Sigma, Tokina and Tamron all make compatible zoom lenses to fit the Maxxum series cameras

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