Reference Manual

429
A
Custom Settings: Fine-Tuning Camera Settings
Selecting [On] for [Shutter speed lock] locks shutter speed at
the value currently selected in mode S or M. Selecting [On] for
[Aperture lock] locks aperture at the value currently selected in
mode A or M.
While shutter speed or aperture lock is in effect, a
O
icon will
appear in the shooting display and control panel.
Shutter speed and aperture lock are not available in the
shooting mode P.
f4: Shutter Spd & Aperture Lock
G
button
U
A
Custom Settings menu