No vignetting and no shadows in macro shooting Equipped with 2.4G wireless transmission, workable as a transmitter or receiver unit in wireless flash group Accurate power adjustment from 1/1 full power to 1/256 at 1/3EV each stop Lithium battery power supply, up to 550 flash times in 1/1 full power Easy to install and suitable for camera lenses with a diameter of 49mm-77mm Two focus assist beams and 10 levels of brightness adjustment Simple user interface, convenient and comfortable operation