This powerful flash with a guide number of 43 is the successor to the popular 430 EX II. The flash automatically zooms with the lens. The range of zoom function extends from 24 to 105mm. This range can be expanded to 14mm with the wide-angle diffuser. The addition of a 2.4GHz radio signal makes the flash suitable for wireless controls with a Speedlite transmitter. The buttons on the 430 EX III are comparable to those on Canon cameras, so the controls are familiar and easy to use. Thanks to the illuminated LCD screen, you can also get started in the dark.