Question about Canon EOS 500D / Digital Rebel T1i Digital Camera

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Object looks like out of focus

Tried T1i with Sigma 18-50 F2.8 and Sigma 70-300 F4.0-5.6, both give unfocused pictures with AF. Sometimes among 10 similar shoots only one is focused, but still very soft. Went to 2 camera repair services: one blamed the body while second said the defect is in lenses...

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  • almazik Aug 12, 2009

    No, but I found out why it is happening, but still don't know who to blame for (body or lenses). Both lenses are focusing closer than the actual target is. It can be easily checked in shortest focal length position by auto-focusing on a long-distance object. Both lenses are focusing on a 3-5meters instead of "infinity sign". I've tried my lenses on other body (guess it was 50D), and they worked well. The only workaround I've found is to auto-focus on object in a longest focal position (by pressing the shutter button half-way), then change the zoom to desired picture, and then take a picture

  • almazik Aug 12, 2009

    No, but I found out why it is happenning, but still don't know who to blame for (body or lenses). Both lenses are focusing closer than the actual target is. It can be easily checked in shortest focal length position by auto-focusing on a long-distance object. Both lenses are focusing on a 3-5meters instead of "infinity sign". I've tried my lenses on other body (guess it was 50D), and they worked well. The only workaround I've found is to autofocus on object in a longest focal position (by pressing the shutter button half-way), then change the zoom to desired picture, and then take a picture.

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Did you find a solution yet? I have the same problem.
A.

Posted on Aug 12, 2009

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Why when you turn the camera appears focus error


Although the manual does not have indicate a focus error, I assume you notice the camera can't focus correct.
I hope you know the camera has a focus selector, see the picture. (in the manual, page 10. For auto focus you should select C-AF (continues) or S-AF (single). If it is in manual, toy should focus yourself using the focus ring on the lens (closest to the camera)
Then to help the focus system, there is a external AF sensor. If it is dirty, then it is difficult for the camera to focus correct in a short time.
Also be aware the camera likes to have extra contrast on the focus distance and no objects in front of the subject you want to pictures, with lots of contrast.

Sometimes point to a object with a sharp contrast, on the same distance, press the shutter release button half, then reframe your picture and only then press the button complete.
when you want to shoot fast moving objects choose C-AF.

I hope this helps.
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You did not say which camera body you are using, but you probably have three different auto-focus modes on you camera. You might be using the wrong one.

The modes are as follows:
AF-A Mode: Camera automatically selects single-servo autofocus when AF-A subject is stationary, continuous-servo autofocus when subject is moving. Shutter can only be released if camera is able to focus. AF-S Mode: For stationary subjects. Focus locks when shutter-release button AF-S is pressed halfway. Shutter can only be released when in-focus indicator is displayed.
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Hi! I have Sigma AF APO 150-500mm (just two month old) accidentally while using auto focus ring was moved manually while it was AF lock mode. Now the lens only works on manual and not auto focus. I use...


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Auto focus not working


Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor. 
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I was focusing to close to the subject & too much glare from a church window.

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Sigma 28-300 3.5-6.3 won't focus


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,
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1 Answer

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,
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