Nikon SB-5000 AF Speedlight - Manual (Page 51)

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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.
Non-TTL Auto 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 reflected flash data.
Distance-priority Manual Flash
Mode
In this flash mode, when the flash-to-subject distance value is entered, the
SB-5000 automatically controls flash output level according to the camera
settings.