Canon MARK IV User Manual (en)

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Custom Function Settings
C.Fn I -10     Select usable metering modes
Disable: All the metering modes (q: Evaluative, w: Partial, r: Spot, 
e
: Center-weighted average) will be selectable.
Enable: Only the metering modes set with [Register] will be selectable.
Register: To make a metering mode unselectable, uncheck the checkmark 
<X>. After entering the settings, select [Apply].
C.Fn I -11     Exposure mode in manual exposure
You can set the metering mode to be used in the manual exposure mode.
0: Specified metering mode
3: Spot metering
1: Evaluative metering
4: Center-weighted average
2: Partial metering
C.Fn I -12     Set shutter speed range
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 15 sec., and the lowest shutter speed can be registered within 
30 sec. to 1/4000 sec. After entering the settings, select [Apply].
C.Fn I -13     Set aperture value range
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/91 to f/1.4, and 
the largest aperture can be registered within f/1.0 to f/64. After 
entering the settings, select [Apply].
With settings 1 to 4, you cannot change the metering mode by pressing the 
<Q> button during shooting.
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