Canon EOS-1V HS manual Fn-4AF activation/AE lock

Custom Function Settings

C.Fn-4AF activation/AE lock

You can achieve focus and obtain the correct exposure separately. You can also stop the AI Servo AF operation temporarily.

C.Fn	Function	No.	Description
		0	Shutter button/AE lock button
	AF activation/	1	AE lock button/Shutter button
C.Fn-4
	AE lock	2	Shutter button/Disabled
			(AF lock)
	: Shutter button
		3	AE lock button/Disabled
	: AE lock button		(→Real-time AE)

C.Fn-4-1:You can focus at one location and obtain AE lock at another location in the scene. Press the < > button to autofocus and press the shutter button halfway to attain AE lock. (→p.71)

C.Fn-4-2: In the AI Servo AF mode, you can press the < > button to stop the AI Servo AF operation momentarily. It prevents the AF from being thrown off by any passing obstruction coming between the camera and subject. The exposure is set when the picture is taken. (→p.36)

C.Fn-4-3: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 when the picture is taken. Thus, the optimum focusing and exposure are always ready for the decisive moment.

C.Fn-4 and C.Fn-19-0/1/2 (→p.110) 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.

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