Canon EOS Digital Rebel XT EF-S 18-55 Kit EOS DIGITAL Rebel XT / EOS 350D Inst - Page 97

Built-in Flash Range

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Using the Built-in Flash Built-in Flash Range With EF-S18-55mm f/3.5-5.6 ll [m / ft] ISO speed 100 200 400 800 1600 Wide angle: 18mm Approx. 1 - 3.7 / 3.3 - 12.1 Approx. 1 - 5.3 / 3.3 - 17.4 Approx. 1 - 7.4 / 3.3 - 24.3 Approx. 1 - 10.5 / 3.3 - 34.4 Approx. 1 - 14.9 / 3.3 - 48.9 Telephoto: 55mm Approx. 1 - 2.3 / 3.3 - 7.5 Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.6 / 3.3 - 21.7 Approx. 1 - 9.3 / 3.3 - 30.5 With EF-S17-85mm f/4-5.6 IS USM [m / ft] ISO speed 100 200 400 800 1600 Wide angle: 17mm Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.5 / 3.3 - 21.3 Approx. 1 - 9.2 / 3.3 - 30.2 Approx. 1 - 13.0 / 3.3 - 42.7 Telephoto: 85mm Approx. 1 - 2.3 / 3.3 - 7.5 Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.6 / 3.3 - 21.7 Approx. 1 - 9.3 / 3.3 - 30.5 ¡ Use the built-in flash at least 1 m/3.3 ft away from the subject. Closer distances will cause the lens barrel to partially obstruct the flash. ¡ When using the built-in flash, detach any hood attahed to the lens. A lens hood will partially obstruct the flash. ¡ A super telephoto lens or fast, large-aperture lens may partially obstruct the built-in flash coverage. In such a case, using an EX-series Speedlite (optional) is recommended. ¡ The built-in flash's coverage is effective with lens focal lengths as short as 17mm. If the lens is shorter than 17mm, the periphery of the flash photo will look dark. ¡ To retract the flash, push it back down. ¡ In the modes, even if you set the shutter speed to one faster than 1/200 sec., it will be set automatically to 1/200 sec. ¡ If autofocus cannot be achieved, the AF-assist beam (small flashes fired by the built-in flash) will be fired automatically (except in the modes). (p.74) 97

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97
Using the Built-in Flash
Built-in Flash Range
With EF-S18-55mm f/3.5-5.6 ll
[m / ft]
ISO speed
Wide angle:
18mm
Telephoto:
55mm
100
Approx. 1 - 3.7 / 3.3 - 12.1
Approx. 1 - 2.3 / 3.3 - 7.5
200
Approx. 1 - 5.3 / 3.3 - 17.4
Approx. 1 - 3.3 / 3.3 - 10.8
400
Approx. 1 - 7.4 / 3.3 - 24.3
Approx. 1 - 4.6 / 3.3 - 15.1
800
Approx. 1 - 10.5 / 3.3 - 34.4
Approx. 1 - 6.6 / 3.3 - 21.7
1600
Approx. 1 - 14.9 / 3.3 - 48.9
Approx. 1 - 9.3 / 3.3 - 30.5
With EF-S17-85mm f/4-5.6 IS USM
[m / ft]
ISO speed
Wide angle:
17mm
Telephoto:
85mm
100
Approx. 1 - 3.3 / 3.3 - 10.8
Approx. 1 - 2.3 / 3.3 - 7.5
200
Approx. 1 - 4.6 / 3.3 - 15.1
Approx. 1 - 3.3 / 3.3 - 10.8
400
Approx. 1 - 6.5 / 3.3 - 21.3
Approx. 1 - 4.6 / 3.3 - 15.1
800
Approx. 1 - 9.2 / 3.3 - 30.2
Approx. 1 - 6.6 / 3.3 - 21.7
1600
Approx. 1 - 13.0 / 3.3 - 42.7
Approx. 1 - 9.3 / 3.3 - 30.5
¡
Use the built-in flash at least 1 m/3.3 ft away from the subject. Closer
distances will cause the lens barrel to partially obstruct the flash.
¡
When using the built-in flash, detach any hood attahed to the lens. A lens
hood will partially obstruct the flash.
¡
A super telephoto lens or fast, large-aperture lens may partially obstruct
the built-in flash coverage. In such a case, using an EX-series Speedlite
(optional) is recommended.
¡
The built-in flash’s coverage is effective with lens focal lengths as short
as 17mm. If the lens is shorter than 17mm, the periphery of the flash
photo will look dark.
¡
To retract the flash, push it back down.
¡
In the <
s
> <
a
> modes, even if you set the shutter speed to one faster
than 1/200 sec., it will be set automatically to 1/200 sec.
¡
If autofocus cannot be achieved, the AF-assist beam (small flashes fired
by the built-in flash) will be fired automatically (except in the <
3
> <
5
>
<
7
> modes). (p.74)