Nikon SB-600 - Flash Value Lock (FV Lock) (for Compatible Cameras)

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Flash Value Lock (FV Lock) (for compatible cameras)
Flash Value, or “FV,” is the amount of flash exposure for the subject. Using FV
Lock with compatible cameras, you can lock in the appropriate flash exposure
for the main subject. This flash exposure remains locked in, even if you change
the aperture or composition, or zoom the lens in and out.
•Available with compatible cameras. You cannot set the FV Lock function on the SB-600
directly. Set it on the camera.
•Available flash mode is i-TTL.
Other functions