The red MAIN lever selector on the left operates the control of the pilot light (in the two available powers) and the TTL flash light reading mode, both with a synchro cable and a fiber-optic cable connections.
Protocol selection (Nikon i-TTL, Canon E-TTL, optical s-TTL) is automatic. The ⚡︎-PL-TTL control lamps indicate the flash readiness, the switching on of the pilot light and the selection of the TTL mode respectively.
The black INPUT lever selector on the right allows us to select input and connection mode that we intend to use: synchro cable socket, fiber-optic cable socket, optical receiver on reflector for slave mode. The control lamps indicate the selected SYN-OPT-SLV input.
The power control is delegated to the central rotary control switch, which operates an encoder.
In manual mode the adjustment will take place at ½ f-stop increments over a range of – 6, while if the TTL mode is selected, the control function will be dedicated to exposure compensation at ⅓ f-stop increments over a range of +/- 2.
The selected setting for power or exposure compensation are clearly visible in the center section of the large display.
Simultaneous one-hand operation of the left and right lever selectors turns the unit on and off.