Canon EOS 40D - 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 between light and dark,
then press the shutter button halfway. (p.80) 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. As long as
the AF point covering the desired subject flashes, you can take the picture.
The beeper continues to beep softly. (The focus confirmation
light <o> also does not light.)
It indicates that the camera is focusing continuously on a moving subject. (The
focus confirmation light 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 will 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>.
When I focus the subject and then zoom up and take the
picture, the focus looks soft.
If you want to zoom, do it before focusing. Turning the zoom ring after
achieving focus may throw off the focus slightly.
Although it is daylight, the flash popped up.
For a backlit subject, the flash may pop up to help reduce harsh shadows on
the subject.
In low light, the built-in flash fired a series of flashes.
To assist the autofocusing, pressing the shutter button halfway may trigger the
built-in flash to fire a series of flashes. 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. The
subject should be at least 1 meter/3.3 feet away from the camera. If a hood (sold
separately) has been attached to the lens, remove it before taking the flash picture.
FAQ