It won't focus when I look into the lens-hole thingy, but when I take a picture with AF it is fully focused and a clear picture. Please help
While looking through the viewfinder, turn the diopter adjustment knob just above and right of the viewfinder to adjust it until the focus marks and other information in the viewfinder become sharp to your eye.
SOURCE: Canon digital camera will not focus
Check your diopter adjustment. It should be a small wheel on the upper right of the viewfinder. It is designed so that people who normally wear eyeglasses can use the viewfinder without their glasses, but it can occasionally get bumped. If the diopter adjustment is way off, it is like looking through someone else's eyeglasses!
SOURCE: My 300D wont lock on a point in its AF setting
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.
SOURCE: my camera cannot focus
There is a little button with +<->- label that is used to 'focus' the viewfinder only. It is used to allow near / far sighted people to use the see thru viewfinder w/o glasses. It is located right next to the see-thru viewfinder.
SOURCE: Problem with Canon EOS D60 Digital Camera
You need to clean the gold contacts with a soft pencil eraser. Remove the lens, and clean the contacts on it. Then hold the camera so the lens opening is pointing down and clean the contacts on the camera. Ensure no debris gets into the camera body and none is left behind on the lens.
Put it all back together and you should be good to go.
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