Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

7

 Custom ControlsN

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If the metering timer is active, you can press the <p> (AF area 
selection) button to directly select an AF area selection mode without 
pressing the <S> button.

When Movie Servo AF is active, you can pause the AF by pressing the 
Depth-of-field preview button or <0>. Press the button again to 
resume Movie Servo AF.

When you press the shutter button halfway, exposure metering is 
performed (AF is not performed).

When you press the button assigned to this function, you can lock the 
exposure (AE lock) while the metering timer is active. Useful when you 
want to focus and meter the shot separately.

The exposure will be locked (AE lock) while you hold down the shutter 
button.

If you assign [AE lock (while button pressed)] to the shutter button, any 
buttons assigned to [AE lock] or [AE lock (hold)] will also work as [AE lock 
(while button pressed)].