Nikon 25414 D2Xs User's Manual - Page 128

Taking Photographs-Flash Photography FV Lock This feature is used to lock flash output, allowing photographs to be recomposed without changing the flash level and ensuring that flash output is appropriate to the subject even when the subject is not positioned in the center of the frame. Flash output is adjusted automatically for any changes in ISO sensitivity, aperture, and Speedlight zoom head position. FV lock is available with CLS compatible flash units only. To use FV lock: 1 Select FV lock for Custom Setting f4 (FUNC. button; 208). 2 Mount an SB-800 or SB-600 Speedlight or SU-800 wireless Speedlight commander on the camera accessory shoe. 3 Turn the Speedlight on and set the flash mode to TTL or AA (see the Speedlight instruction manual for details). 4 Position the subject in the center of the frame and press the shutter-release button halfway to focus. 5 Press the camera FUNC. button. The Speedlight will emit a monitor preflash to determine the appropriate flash level. Flash output will be locked at this level and FV lock icons ( and ) will appear in the control panel and viewfinder. 114