Canon EOS 30D Instruction Manual page 169

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Custom Function Settings
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G.Fn-04, St"lutterl,AE lock:.
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0: AF/AE lock
1: AE 10ck/AF
Convenient when you want to focus and meter separately. Press the <
*
>
button to autofocus and press the shutter button halfway to attain AE lock.
2: AF/AF lock, no AE lock
In the AI Servo AF mode, you can press the <*> button to stop
the AF operation momentarily. This prevents the AF from being
thrown off by any obstacle passing between the camera and
subject. The exposure is set at the moment the picture is taken.
3: AE/AF, no AE lock
This is useful for SUbjects which keep moving and stopping
repeatedly. In the AI Servo AF mode, you can press the <
*
> button
to start or stop the AI Servo AF operation. The exposure is set at the
moment the picture is taken. Thus, the focusing and exposure will
always be at the optimum point as you wait for the decisive moment.
. . C.Fn-04 and C.Fn-18-0, 1,2 (p.174) both have AF start/stop and AE lock
functions. If you have set both these Custom Functions and you execute
both Custom Function operations. the latter operation will not work. The only
exception will be when AF stop is executed after AF start.
G.En-O§ AE-assist Deam
The AF-assist beam can be emitted by the camera's built-in flash or by
the external, EOS-dedicated Speedlite.
0: Emits
1: Does not em it
AF-assist beam not emitted.
2: Only external flash emits
If an external, EOS-dedicated Speedlite is attached, it will emit the
AF-assist beam when necessary. The camera's built-in flash will
I
not emit the AF-assist beam.
[]:I
If the external, EOS-dedicated Speedlite's [AF-assist beam] Custom
Function is set to [Disabled], the Speedlite will not emit the AF-assist beam
even if the camera's C.Fn-05-0/2 is set.
169