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Check your focus modes to see if you are using one that is different to usual. When a DSLR has no focus lock it won't take a picture. Also verify that the focus motor in the lens is working ok. Google 'lens focus tests' and see what you can come up with.
Your problem may be that the camera is "locked" on manual focus. If so, you will need to go to the menu, scroll to "2" menu in "P" mode, and click on "focusing mode". From there, hit "single focus or continuous focus." It should correct the problem. Also, is the lens dirty? A dirty lens will not benefit the camera. The light may be too low, also. Try using a flashlight to focus, then take the picture.
I own Rebel XT and Canon 50mm f1.8 MKII lens with plastic mount and noticed many pictures with missed focus, either front or back focusing. Meaning objects slight forward or below the intended subject is in focus. I've sent my body and the lens to Canon for evaluation and thet adjusted my focus sensors on the body. I still have problems and there are many threads related to focusing on this camera with 50mm f1.8 that the sensors on this camera do not do so well with fast lens and prone to missed focus.
Test your camera's focusing ability with a book or magazine where you focus on just one specific line and see if it is truly in focus when you review the picture.
Check that the lens and other elements on the front of the camera are free from dust and grime.
The focus mechanism is not functioning properly and may need to be serviced.
check the contacts on the lens... since it is copper and would develop copper rust... clean with iso alcohol and let air dry for an hour... clean the contacts on the camera too.
reset the camera back to factory defaults by mode dial to p, press menu, and custom reset back to factory defaults
also certain camera settings such as focus points and iso will help in low light
hi,
I suggest a trial with new fresh batteries and also check the focus mode, if your problem still remain, no way go to canon shop and ask them for upgrade your camera, i think it may be free.
good luck...
Without seeing a photo, here are a few possibilities.
1) Shutter speed too low (camera shake).
2) Camera is focusing on something in the foreground.
3) Focus not locked, low light, low contrast scene.
Items 2 and 3 can be corrected by manual focus. Set the focus to 1 click below infinity, depth of field will insure everything is in focus. For item 1 remember that the shutter speed must be 1/125 sec or faster at full zoom to avoid camera shake.
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