Nikon COOLPIX P7800 Reference Manual - Page 188

Using the Commander Mode When the flash mode (A59) is set to z (commander mode), you can wirelessly control an off-camera optional flash unit. • Set the group and channel settings for the remote flash unit to "Group A" and "3 CH," respectively. • Place the flash unit within the range shown in the diagram below. • Set up the remote flash unit facing the camera to ensure that the light from the built-in flash will enter the wireless remote sensor window of the remote flash unit. Set up the remote flash unit in a position closer to the subject than the camera. 50° or less Approx. 5 m (16 ft) or less 30° or less Approx. 3.5 m (11.5 ft) or less Camera (built-in flash) 30° or less Approx. 3.5 m (11.5 ft) or less 50° or less • The distances shown in the diagram above may vary depending on the surrounding environment. Reference Section E60