Nikon Df - Manual (Page 137)

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A
The Sync Terminal
A sync cable can be connected to the sync
terminal as required. Do not connect another
flash unit via a sync cable when performing rear-
curtain sync flash photography with a flash unit
mounted on the camera accessory shoe.
D
Use Only Nikon Flash Accessories
Use only Nikon flash units. Negative voltages or voltages over 250 V
applied to the accessory shoe could not only prevent normal operation,
but damage the sync circuitry of the camera or flash. Before using a
Nikon flash unit not listed in this section, contact a Nikon-authorized
service representative for more information.