Canon eos rebel T2i - Manual (Page 47)

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1 Fully Automatic Shooting
The focus confirmation light <o> blinks and focus is not achieved.
Aim the AF point over an area having good contrast, then press the
shutter button halfway (p.202). If you are too close to the subject,
move away and try again.
Sometimes multiple AF points flash simultaneously.
This indicates that focus has been achieved at all those AF points. When
the AF point covering the desired subject flashes, take the picture.
The beeper continues to beep softly. (The focus confirmation
light <o> does not light.)
It indicates that the camera is focusing continuously on a moving
subject. (The focus confirmation light <o> does not light.) While the
beeper is beeping, you can press the shutter button completely to
shoot a moving subject in focus.
Pressing the shutter button halfway does not focus the subject.
When the focus mode switch on the lens is set to <MF> (Manual Focus), the
camera does not focus. Set the focus mode switch to <AF> (Auto Focus).
Although it is daylight, the flash popped up.
For a backlit subject, the flash may pop up to help reduce the
subject’s dark shadow.
In low light, the built-in flash fired a series of flashes.
Pressing the shutter button halfway may trigger the built-in flash to
fire a series of flashes to assist autofocusing. This is called AF-assist
beam. It is effective up to approx. 4 meters/13.1 feet away.
Although flash was used, the picture came out dark.
The subject was too far away. The subject should be within 5
meters/16.4 feet from the camera.
When flash was used, the bottom part of the picture came out
unnaturally dark.
The subject was too close to the camera, and a shadow was created
by the lens barrel. The subject should be at least 1 meter/3.3 feet
away from the camera. If a hood has been attached to the lens,
remove it before taking the flash picture.
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