C: timers/ae lock, C1: shutter-release button ae-l, C2: auto meter-off delay – Nikon D90 User Manual

C: timers/ae lock, C1: shutter-release button ae-l, C2: auto meter-off delay | C3: self-timer, C2: auto meter-off delay c3: self-timer | Nikon D90 User Manual | Page 199 / 300