Opteka EF-710 DG Super TTL Autofocus Dedicated Flash for Sony Alpha A900, A850, A700, A580, A560, A390, A380, A350, A330, A230, A77, A65, A57, A55, A37, A35 and NEX-7 Digital SLR Cameras Works on all Sony Alpha digital SLR cameras Bounce capabilities in 5 steps up to 90 degrees; flash shooting distance range from 2 and up to 72 feet 35mm angle of coverage with Sony digital SLR cameras Operates on two AA batteries; fast 0.3-10 second recycling time Guide number (ISO100) 22(m)/72(ft) at 35mm