Nikon Df - Manual (Page 136)

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Flash Photography
The camera supports the Nikon Creative Lighting System (CLS)
and can be used with CLS-compatible flash units. Optional flash
units can be attached directly to the camera accessory shoe as
described below. The accessory shoe is equipped with a safety
lock for flash units with a locking pin.
1
Remove the accessory shoe cover.
2
Mount the flash unit on the
accessory shoe.
See the manual provided with the flash
unit for details.
Using a Flash