Yongnuo YN 560 III 2.4G Wireless Flash Speedlight for Panasonic Canon Nikon Pentax Olympus Digital Camera DSLR Supporting high speed continuous shooting Super speed of charging recycle The Improved power saving mode New Power zoom function: You can push the button on the flash and make it covered focal length range from 24mm to 105mm Maually set the zooming position:The coverd focal length of the flash will switch in circel of 14 / 28 / 35 / 50 / 70 / 80 / 105mm by pressing the button