Canon EOS-1DS Mark III Instruction Manual page 177

Custom Function Settings
You can change how long the function settings remain in effect after you let
go of the respective button.
Disable: The timer length is set to the default.
Enable: The timer length is set to the time set with [Register].
Register: You can set the 6-sec. and 16osec. timer length and the timer
length for after the shutter release. The timer length can be set to
0 sec. to 59 sec. or 1 min. to 60 min. After entering the settings,
select [AppJy].
,6osec. timer: Works with the metering while you shoot through
the viewfinder. Also works when you press the
<%> button for AE lock.
,16-sec. timer: Works when you press the
<FEL>
button for
multi-spot metering and FE lock. Also works
during Live View shooting for metering and
pressing the <-_ > button for AE lock.
, Timer after release: Normally, the timer is 2 sec. after the
picture is taken. A longer timer length wiiJ
make it easier to use AE lock at the same
exposure,
Normally, stabilization control is executed for the shutter-release time lag.
This stabilization control can be omitted to make the shutter-release time
lag shorter.
O: DisabJe
1: Enable
When the aperture is stopped down to no more than 3 stops from the
maximum aperture, the shutter-release time lag will be as much as
about 20% shorter than normal.
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