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Assign [Switch to registered AF functions] to the
button or button with [Custom Controls]. Press the
button on the assign function’s selection screen, and
from various AF functions, select the [AF area selection
mode], and select the mode that you want to use.
Assign to the
or
depth of field preview
button
Select the [AF area
selection mode]
Press the
button
now
[Switch to registered AF functions]
Set up steps