Flash Value Lock ( Fv Lock; Slow Sync; Red-Eye Reduction/Red-Eye Reduction Slow Sync - Nikon SB-910 User Manual

Flash value lock ( FV lock)

The SB-910 sets the fl ash output to locked fl ash 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 fl ash is controlled at a low shutter speed to obtain the correct exposure for
both the main subject and background in low-light situations.
• Since low shutter speeds are normally used, use of a tripod is recommended to
prevent camera shake.
Red-eye reduction/ red-eye reduction slow sync
To prevent a subject's eyes from appearing red in color pictures shot in low light, the
SB-910 fi res three fl ashes at reduced output moments before the picture is taken.
• With red-eye reduction slow sync, red-eye reduction is combined with slow-sync
flash.
• Since low shutter speeds are normally used in red-eye reduction slow sync, use of
a tripod is recommended to prevent camera shake.
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