Canon EOS 10D Normal, Select Home Position, Select HP while pressing, Av+/- AF point by QCD

Custom Function Settings

C.Fn-13	Assist button function
	Changes the function of the <	> button.
	0: Normal
	Pressing the < > and <	> buttons simultaneously selects
	the registered AF point.
	1: Select Home Position
	Pressing only the < > button selects the registered AF point.
	2: Select HP (while pressing)
	The registered AF point is selected only while the <		>
	button is held down. When you let go of the button, the
	previous AF point is selected.
	3: Av+/– (AF point by QCD)
	Assigns the exposure compensation and manual aperture
	setting functions to the <	> button. Hold down the <		>
	button and turn the < > dial to set either. Or turn the <			>
	dial to select the AF point. The AF point selection sequence is
	shown on the left.
	4: FE lock
	The < > button sets FE lock. When C.Fn-04-1/2/3 (→p.146)
	is set, FE lock will be enabled. In this case, the <		> button
	does not set FE lock.

C.Fn-14	Auto reduction of fill flash
	0: Enable
	Obtains natural-looking, daylight flash shots automatically.
	1: Disable
	Prevents underexposure of a personnel subject set against a
	bright background such as a sunset.

C.Fn-15 Shutter curtain sync

0:1st-curtain sync

1:2nd-curtain sync

By using a slow sync speed, you can create a light trail following a moving subject. The flash fires 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 capability. If an EX-series Speedlite having this capability is set for 2nd-curtain sync, it will override this Custom Function.

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