c1: Shutter-Release Button AE-L
G button
UACustom Settings menu
Choose whether exposure locks when the shutter-release button is pressed.
Option Description
O
[On (half press)] Pr
essing the shutter-release button halfway locks exposure.
P
[On (burst mode)]
Exposure only locks while the shutter-release button is pressed all the
way down.
[Off] Pressing the shutter-release button does not lock exposure.
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c1: Shutter-Release Button AE-L