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Be aware you only can choose the focus points when you are in a manual mode. So as long as your camera is in automatic it won't work. I could not find the Canon manual, but still managed to find this:
Actually what I found to solve the problem was to first set the lens in "MF" and practice taking a picture manually to see if that would work. When I did this, I discovered that the fine tuning portion of the lens was somehow stuck mechanically. I heard a loud click as I turned it. That was all it took to fix the focusing mechanism on the lens. Then I set to "AF" and Voila, the camera worked just fine.
Auto Focus does not determine exposure. Only sharpness. "Wrong" exposure could be due to the metering mode being set in Spot Metering. Set it back to Evaluative Metering which may improve the overall even exposure of your shots. Test your shots in full auto or P mode. M (Manual) mode will require you to check the exposure setting manually (you can see the indicator in the viewfinder when you half-press the trigger)
use more light:)
its very normal that it does that. it dosent get enough light so it
cant focus. the only way it can autofocus is that it stobes the flash
to adjust the focus automaticly. use an external flash like 580EX and u
will get an focus asisten thru a red grid throne by the flash unit.
I had the same problem a few moths ago when I tried to use a Quanta lens. Go into the second tools menu, select clear settings, then select Clear all Custom Functions. It worked for me I hope it works for you.
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