If On is selected when the camera is used with an optional flash unit that supports the Nikon Creative Lighting system, pressing the button to which Preview has been assigned using Custom Setting f2 (Custom control assignment) emits a modeling flash that can be used to preview the effects of flash lighting. No modeling flash is emitted if Off is selected.

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