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 be displayed. Shutter speed and aperture lock are not available in mode P.

A Custom Settings: Fine-Tuning Camera Settings

a: Autofocus

b: Metering/exposure

c: Timers/AE lock

d: Shooting/display

e: Bracketing/flash

f: Controls

g: Movie