78 Menu Guide/Custom Settings14: Built-in Flash (P, S, A, and M Modes Only)Choose a flash control mode for the built-in flash or the optionalSB-400 Speedlight.TTL (default): Flash output is adjusted automatically in response toshooting conditions.Manual: The flash fires at the level selected in the menu shown atright. At full power, the built-in flash has a Guide Number of 13/43(ISO 100, m/ft., 20°C /68 °F).A icon flashes in the viewfinder and shooting information dis-play when Manual is selected.The Optional SB-400 SpeedlightWhen an optional SB-400 Speedlight is attached, Custom Setting 14 isused to choose the flash control mode for the SB-400 and the namechanges to Optional Speedlight.15: Auto off TimersChoose how long the monitor and exposure meters ( 14)remain on when no operations are performed. Choose a shorterauto off delay for longer battery life.Note that the shooting information display turns off automatically when the exposure metersturn off. When a remote control is used ( 33), the monitor and exposure meters remain onfor the length of time selected for Custom Setting 17 (Remote on duration; 79).Auto OffRegardless of the setting chosen, the exposure meters do not turn off automatically when the camerais powered by an optional EH-5 AC adapter and EP-5 AC adapter connector ( 103). The camera doesnot turn off automatically when connected to a computer ( 55) or PictBridge printer ( 57).Option DescriptionShort Monitor and exposure meters remain on for 4s. When Image review is on, pictures aredisplayed in monitor for 4s after shooting ( 75).Normal(default)Monitor and exposure meters remain on for 8s. When Image review is on, pictures aredisplayed in monitor for 4s after shooting ( 75).Long Monitor remains on for 20s; exposure meters remain on for 1minute. When Imagereview is on, pictures are displayed in monitor for 20s after shooting ( 75).Custom Choose monitor off delay and image review time from 4s, 8s, 20s, 1minute, and10minutes. Choose auto meter-off delay from 4s, 8s, 20s, 1minute, or 30minutes.