Canon EOS 10D - Manual (Page 150)

150
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.