Optically Triggering FJ800 and FJ400iiUpdated 5 days ago

The FJ400ii and FJ800 feature an optical sensor that allows it to be triggered remotely by another flash or strobe unit fired nearby. 
This sensor is located near the mini plug and USB-C input at the bottom of the unit.
It’s important to know the location of the optical sensors as they need a line of sight of the triggering flash. It is only available when units are set to Manual mode, as TTL and HSS data cannot be transmitted.

Enabling optical triggering with the FJ800 and FJ400ii

1. Enter the Settings Menu: Press and hold the Menu button on the touch screen until you enter the settings menu.
2. Enable Optical Sensor: On the settings page 2/4 turn Optical Sensor "ON"

With the optical sensor activated, units will fire simultaneously with an initial flash from any make or model, provided the flash output is sufficient and the sensor detects the signal.

Preventing Sleep Mode: 

1. Press and hold the Menu button on the touch screen until you enter the settings menu.  
2. On the settings page 2/4 set Sleep to "Off" or your desired setting.