Nikon D6 Reference Manual page 714

❚❚ Repeating Flash
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D
Flash Info and Camera Settings
The flash information display shows select
camera settings, including exposure mode,
shutter speed, aperture, and ISO sensitivity.
D
Changing Flash Settings
Flash settings can be changed by pressing the
i button in the flash info display. The options
available vary with the flash unit and the
settings selected. You can also test-fire the
flash.
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Flash Info for On-Camera Units
Flash control mode ( 0 645)
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Output ( 0 645)
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Times ( 0 645)
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Frequency ( 0 645)