Nikon SB-5000 Reference Manual page 124

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Remote flash unit groups A, B and C (optical control)
Up to 3 groups of remote flash units (A, B, C) can be set up for optical
control.
• Former Speedlight model attached to a camera is the master flash unit.
• Choose optical control remote mode when using the SB-5000 as remote
flash unit in groups A, B and C.
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Camera and WR-R10 (radio control)
A radio control-compatible camera (D5 or D500) with the WR-R10
attached controls the remote flash unit groups D, E and F.
• For details, see the camera user's manual.
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Remote flash unit groups D, E and F (radio control)
Up to 3 groups of remote flash units (D, E, F) can be set up for radio control.
• Camera with the WR-R10 attached controls the flash function.
D
• For details, see the camera user's manual.
D-44