Flash value lock (fv lock), Slow sync, Functions to be set on the camera – Nikon Speedlight SB-700 User Manual
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Functions
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Flash value lock (FV lock)
The SB-700 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
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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.
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FV lock also functions in Advanced Wireless Lighting.
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The available flash modes are i-TTL and quick wireless control.
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FV stands for flash value, meaning flash illuminated subject exposure.
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Slow sync
The fl ash is controlled at a slow shutter speed to obtain the correct
exposure for both the main subject and background in low-light
situations.
Since slow shutter speeds are normally used, use of a tripod is
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recommended to prevent camera shake.
Functions to Be Set on the Camera