Canon EOS-1DS Mark III Instruction Manual page 172

Custom Function Settings
0: Normal
1: Brighter
Enables or disables the EOSodedicated Speedlite's AF-assist beam.
O: Enable
The external Speedlite will emit the AF-assist beam when necessary.
1: Disable
The externa I speedlitds custom Euncti0n [AE-assJst beam firing] set to
[D!sab!e] will override this Custom Function% 0 setting_
See page 104 for the mirror Iockup procedure.
0: Disable
1: Enable
2: Enable: Down with SET (button)
N w_th S_tt!ng _ and 2,thea*7; i;on W_ appear 0n thet_P LCD Pane!i
Disable: Continuous shooting will be enabled: <_H>: Approx. 5 fps,
<DJjL>: Approx. 3 fps
_=nable: The continuous shooting speed set with [Register] will be enabled.
Register: < D-JjH> can be set within 2 fps to 5 fps, and <DJJL> can be set
within 1 fps to 4 fps. After entering the settings, select [Apply].
Disable: No limit is set on the continuous shot count. (Continuous
shooting will be possible up to the maximum burst indicated.)
Enable: The continuous shooting will be limited to the number set with
[Register] after which the shooting will stop automatically.
Register: The continuous shot count can be limited to 2 to 99. After
entering the settings, select [Apply].
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