Optically Triggering FJ100 Strobe, FJ250, FJ400 II and FJ800Updated 12 hours ago

The FJ100 Strobe, FJ250, FJ400 II and FJ800 feature an optical sensor that allows them to be triggered remotely by another flash or strobe unit fired nearby. 

On the FJ250, FJ400 and FJ800, this sensor is located near the mini plug and USB-C input at the bottom of the unit.

On the FJ100 Strobe, this sensor is located on the opposite side of the power button.

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

FJ800 and FJ400 II

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"

FJ250 and FJ100 Strobe

1. Enter the Settings Menu: Swipe down from the top to enter the settings menu.
2. Enable Optical Sensor: Swipe up in the menu until OPT SENSOR is displayed and touch it. Then, touch "ON" to enable. 

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: 

FJ800 and FJ400 II

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" to disable or your desired setting.

FJ250 and FJ100 Strobe

1. Swipe down from the top to enter the settings menu. 
2. Swipe up in the settings menu until "SLEEP" is displayed and touch it.
3. Select the amount of time you wish the FJ250 will stay on until it powers itself off. Or, select "OFF" to disable the auto-off function.