Nikon SB-5000 Reference Manual

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Flash Modes
Manual Flash Mode
In manual flash mode, aperture and flash output level are manually 
selected. This allows for control of exposure and flash-to-subject distance.
•  The flash output level can be set from M1/1 (full output) to M1/256 to 
suit creative preferences.
•  Monitor pre-flash and the indication of insufficient flash output for 
correct exposure are not available in manual flash mode.
Manual flash mode LCD example
Flash output level
Effective flash output 
distance (numerical 
indicator)
Effective flash output 
distance (▼)