Canon MARK IV User Manual (en)

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Custom Function Settings

0: Default (from LV)
1: Quick start (<I> button)

If the [6 Live View/Movie func. set.] menu option has been set to 
enable movie shooting (p.142), press the <I> button to start shooting 
a movie immediately while the camera is ready to shoot.

If you change the focusing screen, change this setting to match the 
focusing screen type. This is to obtain the correct exposure.
0: lEc-C IV

Standard focusing screen (Laser-matte).

1: lEc-A, B, C, C II, C III, D, H, I, L

For Laser-matte screens.

2: pEc-S

For Super Precision Matte screens.

3: kEc-N, R

For New Laser-matte screens.

 

This focusing screen is optimized for f/1.8 to f/2.8 lenses.

 

If the lens maximum aperture is brighter than f/1.8, the center spot 
metering circle and Area AF frame might become difficult to see.

 

Also, if the lens maximum aperture is slower than f/2.8, the viewfinder 
will look darker.

 

Since the Ec-A, Ec-B, Ec-I, and Ec-L focusing screens have a prism at 
the center, correct exposures cannot be obtained with evaluative 
metering and center spot metering. Use either center-weighted average 
metering or AF point-linked spot metering (except the center AF point).

 

To change the focusing screen, refer to the instructions that come with 
the focusing screen.

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