Question about Canon Digital Rebel / EOS-300D Digital Camera with EF-S 18-55mm Lens

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My 300D wont lock on a point in its AF setting

Hi, i have the Canon 300D and when i set it to the AF mode and point the camera on a subject for it to focus on, it wont. the lens still turns just like its trying to find something to focus on however it just goes through the whole focus limits and wont ever be in focus, does anyone know why?

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  • acphotos Apr 02, 2009

    THis is exactly what my camera is doing. It won't lock in on an object in autofocus with either lens I use. (I shoot with a EF 24-105 IS L lens most of the time) I did have the mirror fixed, being the mostly dark images started happening shortly after that. The mirror works fine now, but it still won't lock in on an object. It zooms all the way in, and then all the way back out. Can anyone tell me if this is a wiring issue? Or is it possible it's just a software issue?

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If you are unable to focus in broad daylight and it just hunts through the whole focus range without locking, then it sounds like a problem with sub-mirror pin (also called the second mirror pin). My 300D just had this problem and I had to send to service to get fixed. I sent to http://www.keh.com/ as they were at least $50 cheaper than going straight to Canon. Just got it backed and it works like a charm again.

Posted on Jul 29, 2007

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Your AF might not be working if you are in low light conditions. A simple solution is to obviously turn some lights on, or you can turn the AF Assist lamp on, which lights the subject to ensure proper focusing. My D50 does this from time to time if conditions aren't great. Hope this helps.

Posted on Jul 27, 2007

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That's a pretty big question, and we don't know what level of answer you're looking for, but very basically, you need to check that everything is set up correctly, and start off with the AUTO mode. So...

1. Lens fitted, and lens cap off?
2. Battery charged and fitted?
3. Memory card inserted in the slot?
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