Nikon SB-5000 Reference Manual

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Flash Modes
Auto Aperture Flash Mode
The SB-5000’s light sensor for non-TTL auto flash measures the flash that 
is reflected on the subject, and the SB-5000 controls the flash output level 
according to the lens and camera information transmitted to the SB-5000, 
including ISO sensitivity, exposure compensation value and aperture.
•  When no aperture information is transmitted to the SB-5000, the flash 
mode is automatically set to non-TTL auto flash.
Auto aperture flash mode LCD example
  :  Monitor pre-flashes
:  Auto aperture flash
t
 Monitor pre-flashes
•  Monitor pre-flashes can be activated or canceled as a non-TTL auto flash 
mode option in the custom settings (0B-24).
•  Flash output is controlled more accurately with monitor pre-flashes. 
The SB-5000 emits monitor pre-flashes before actual firing to obtain 
reflected flash data.
•  Monitor pre-flashes should be activated when auto FP high-speed sync