Canon eos rebel t1i - Manual (Page 63)

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D Using the Built-in Flash
If the subject is far away, increase the ISO speed.
By increasing the ISO speed, you can extend the flash range.
In bright light, decrease the ISO speed.
If the exposure setting in the viewfinder blinks, decrease the ISO speed.
Detach the lens hood and keep at least 1 meter/3.3 feet away
from the subject.
If the lens has a hood attached or you are too close to the subject,
the bottom of the picture might look dark due to the obstructed flash.
For important shots, check the image on the LCD monitor to make
sure the flash exposure looks good (not dark at the bottom).
Using the red-eye reduction lamp before taking a flash picture can
reduce red eye.
Red-eye reduction will work in any shooting mode except <3> <7>
<5> <k>.
Under the [1] tab, select [Red-eye
On/Off], then press <0>. Select
[On], then press <0>.
For flash photography, when you
press the shutter button halfway, the
red-eye reduction lamp will light. Then
when you press the shutter button
completely, the picture will be taken.
Shooting Tips
3 Using Red-eye Reduction
The red-eye reduction feature is most effective when the subject looks at
the red-eye reduction lamp, when the room is well lit, or when you go
closer to the subject.
When you press the shutter button halfway, the viewfinder
display on the bottom will gradually turn off. For best
results, take the picture after this display turns off.
The effectiveness of red-eye reduction varies depending on the subject.