Nikon SB-5000 AF Speedlight Reference Manual - English - Page 160
Flash value lock (FV lock), Slow sync, Red-eye reduction
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Flash value lock (FV lock) The SB-5000 sets the flash output to locked flash exposure. This maintains the subject's illumination, even if the composition changes. • The flash exposure level (brightness) remains the same even when the aperture is changed or lens is zoomed in and out, because the flash output level automatically changes. • Several frames can be shot during FV lock operation. • FV lock also functions in Advanced Wireless Lighting. • The available flash modes are i-TTL, auto aperture flash with monitor pre-flashes and non-TTL auto flash with monitor pre-flashes. • FV stands for flash value, meaning flash illuminated subject exposure. Slow sync The flash is controlled at a low shutter speed to obtain the correct exposure for both the main subject and background in low-light situations. E • Since low shutter speeds are normally used, use of a tripod is recommended to prevent camera shake. Red-eye reduction The SB-5000 fires 3 flashes at low output just before the picture is taken to reduce the red-eye effect caused by the flash light. E-32 Functions