Canon EOS-1DS Mark III Instruction Manual page 161

[_ Custom Function Settings
Disable: All the metering modes (Co3: Evaluative, Co:3:Partial, C'3: Spot,
C3: Centeroweighted average)will be seleetable.
Enable: Only the metering modes set with [Register] will be selectable.
Register: To make a metering mode unselectable, uneheck the cheekmark
< v' >. After entering the settings, select [AppRy].
You can set the metering mode to be used in the manual exposure mode.
0: Specified metering mode
1: Evaluative metering
2: Partial metering
3: Spot metering
4: Center-weighted average
With Settings 1 t0 4.,You cannot change the metering mode by pressing the
<m.[_> button during shooting,
Disable: The settable shutter speed range will be 1/8000 sec. to 30 sec.
Enable: The settable shutter speed will range from the highest shutter
speed to the lowest shutter speed set with [Register].
Register: The highest shutter speed can be registered within 1/8000 sec.
to 1/250 sec. and the lowest shutter speed can be registered
within 30 sec. to 1/60 see. After entering the settings, select
[Apply].
Disable: The settable aperture will range from the camera-attached lens'
maximum aperture to minimum aperture.
Enable: The settable aperture will range from the smallest to largest
aperture set with [Register].
Register: The smallest aperture can be registered within f/1.4 to f/91, and
the largest aperture can be registered within f/1.0 to f/64. After
entering the settings, select [Apply].
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