Users can also use it as an optical slave in addition to use as a radio TTL master/slave unit. It is versatile as well with the ability to tilt from -7 to 90° and rotate 270°. Wireless Master/Slave TTL Functionality.
The flash will fire pre-flashes, but not the main flash in any of the shooting modes. I did research about the paint problem in the grooves of the hot shoe and followed instructions with negative results. I will keep trying but I’m not happy with this flash.