Bower SFD14S Digital Macro Ring Flash for Sony A100/200/230/290/300/330/350/380/390/450/500/560/550/700/850/900 Digital SLR Cameras Bounce and swivel zoom head allows versatile reflection for difficult lighting conditions Guide Number: 46 feet (50mm @ ISO 100) For Macro, Medical and Hobby Photography Compatible with all Sony Alpha models including: A100, A200, A230, A290, A300, A330, SLT-A33, A350, A380, A390, A450, A500, A560, SLT-A55, A550, A700, A850, and A900 EV exposure control that synchs with Sony Alpha SLR cameras