Canon EOS40D instruction manual Using Red-eye Reduction, 100, Effective Range of Built-in Flash

Using the Built-in Flash

Effective Range of Built-in Flash				[Approx. meters/feet]
	ISO	EF-S 18-55mm f/3.5-5.6 IS		EF-S 17-85mm f/4-5.6 IS USM
	Speed	Wide Angle:	Telephoto:	Wide Angle:	Telephoto:
		18mm	55mm	17mm	85mm
100		1 - 3.7 / 3.3 - 12.1	1 - 2.3 / 3.3 - 7.5	1 - 3.3 / 3.3 - 10.8	1 - 2.3 / 3.3 - 7.5
200		1 - 5.3 / 3.3 - 17.4	1 - 3.3 / 3.3 - 10.8	1 - 4.6 / 3.3 - 15.1	1 - 3.3 / 3.3 - 10.8
400		1 - 7.4 / 3.3 - 24.3	1 - 4.6 / 3.3 - 15.1	1 - 6.5 / 3.3 - 21.3	1 - 4.6 / 3.3 - 15.1
800		1 - 10.5 / 3.3 - 34.4	1 - 6.6 / 3.3 - 21.7	1 - 9.2 / 3.3 - 30.2	1 - 6.6 / 3.3 - 21.7
1600		1 - 14.9 / 3.3 - 48.9	1 - 9.3 / 3.3 - 30.5	1 - 13.0 / 3.3 - 42.7	1 - 9.3 / 3.3 - 30.5
H: 3200		1 - 21.0 / 3.3 - 68.9	1 - 13.1 / 3.3 - 43.0	1 - 18.4 / 3.3 - 60.4	1 - 13.1 / 3.3 - 43.0

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. If you use a telephoto lens or a fast lens and the flash is still partially obstructed, use an EX-series Speedlite (sold separately).

3Using Red-eye Reduction

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>.

Under the [1] tab, select [Red-eye On/Off] and press <0>. Set it to [On], then press <0>.

In 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.

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 from subject to subject.

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