Canon EOS 30D Instruction Manual page 173

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Custom Function Settings
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0: Evaluative
Fully automatic flash photography for all conditions, from low light
to daylight fill-flash.
1: Average
The flash is averaged for the entire area covered by the flash. Since automatic
flash exposure compensation will not be executed, you may have to set it
yourself depending on the scene. This also applies if you use FE lock.
0.En-15 Shutter curtain
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0: 1st-curtain sync.
1: 2nd-curtain sync.
When aslow shutter speed is set, you can capture a light trail following the subject.
The built-in flash or external Speedlite fires the flash right before the shutter closes.
This Custom Function can be used to obtain 2nd-curtain sync effects even with EX-
series Speedlites which do not have this feature. If the EX-series Speedlite has this
feature, it will override this Custom Function.
. . When 2nd-curtain sync is used, a preflash will be fired for flash metering control right after you press
the shutter button completely. Remember that the main flash will fire right before the shutter closes.
0: Disable
1: Enable
This works in the shutter-priority
AE
(TV) and aperture-priority AE
(Av)
modes. If the subject's brightness changes suddenly and the current
shutter speed or aperture becomes unsuitable, the shutter speed or
aperture is shifted automatically to obtain a suitable exposure.
0.En-17' Magnified view
0: Image playback only
Magnified view is possible while the image is displayed after you
press the playback button. (p.117)
1: Image review and playback
To magnify the image during the image review, hold down the
< ~ >
button and press the
<
<±l.
>
button. You can also magnify the view in the same procedure as C.Fn-17-0.
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