Question about Sigma 10-20mm f/4-5.6 EX DC HSM Autofocus Super Wide Angle Zoom Lens

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My Sigma 10-20mm wide angle lens stopped adjusting when I focus. I'm still able to turn the focus ring, but the lens doesn't move and neither does the the thing that shows you the infinity bar. The lens is less than 4 months old, never been dropped, smashed, or had any water damage etc.

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  • Harrie Dec 14, 2014

    Hi Kevin , I want to help you with your question, but I need more information from you. Can you please add details in the comment box? On what camera are you using this lens? brand and model please

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SOURCE: Sigma 18 -200 lens with D40x

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Posted on Jun 09, 2008

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SOURCE: sigma 24-70 2.8 EX DG AUTOFOCUS PROBLEM

I would send it into sigma. They are in NY,
They are really quick about checking things out and I have neverhad them charge me to look at a lens and tell me whats up. aot of times they will just fix it while it there is it looks like something is worn out from normal use.
its a great lens. Some would say its a slower focus. than the Canon brand and you do get what you pay for but its hard to spend as much on canon lenses as they want. :)

Hope that helps,
Caleb

Posted on Jul 02, 2008

  • 1 Answer

SOURCE: sigma 70-300 mm lens wont focus

I was focusing to close to the subject & too much glare from a church window.

Posted on Sep 28, 2008

SOURCE: Front/Back Focus Problem at Sigma 30mm F1.4 Lens

Hello Abdul!
I recommend that you print this test chart: http://www.photo.net/learn/focustest/scale45.jpg
Just print it on an ordinary paper, then put it on a table, and take a picture at it from a 45 degree angle, using the center focusing point only, aimed at the thicker line in the middle. The numers are centimeters. Take the test picture at f/1.4. Make sure you have good light so you get a fast shutter time. If you have a tripod, mount the camera on the tripod prior to taking the test picture.
Then examine the picture in your computer, zoomed to 100%. Now it should be clear wheter you got back- or front focus, and how large the problem is.
Unfortunately, there is no way for you to adjust the camera and lens combination yourself, you will have to send/bring the camera to an autorized camera workshop. This is covered by the warranty.
Hope this helps!
Regards, 
/Chris

Posted on Jan 19, 2009

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SOURCE: broken zoom ring on sigma telephoto lens

HI I need to no what fit the lens is

Posted on Aug 08, 2009

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Hi, i have the Sigma 70-200mm for Canon EF and the manual focus don't work. The HSM works fine and focuses perfect, but if you choose MF, you can't rotate the focus-ring. Many greetings from Germany! Kai


Hi, not sure if you still have this issue. I have just decided to look into it again, as I had a lot of focus problems with my Sigma 70-200mm HSM lens. Since there is no Sigma support here in Beijing, I took a look - and fixed it.

Here is what I did: On the front of the lens barrel is the rubberised focus ring. This can be removed (gently ply it away from the barrel by sticking a flat bit (or plastic letter opener) between the barrel and the rubber grip. It will come not entirely loose, so you need to work your way around the lens. Keep doing that until you moved it about half way forward. At this point two fixing screws become accessible on the barrel below.

In my case, one of the screws had come loose and that blocked the focus ring from turning, as the screw was blocking rotation in the access hole on the barrel.

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Hello Abdul!
I recommend that you print this test chart: http://www.photo.net/learn/focustest/scale45.jpg
Just print it on an ordinary paper, then put it on a table, and take a picture at it from a 45 degree angle, using the center focusing point only, aimed at the thicker line in the middle. The numers are centimeters. Take the test picture at f/1.4. Make sure you have good light so you get a fast shutter time. If you have a tripod, mount the camera on the tripod prior to taking the test picture.
Then examine the picture in your computer, zoomed to 100%. Now it should be clear wheter you got back- or front focus, and how large the problem is.
Unfortunately, there is no way for you to adjust the camera and lens combination yourself, you will have to send/bring the camera to an autorized camera workshop. This is covered by the warranty.
Hope this helps!
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