Bower SFD296S Digital Automatic Flash for Sony Full Automatic Mode lets the Flash Light Sensor determine the correct amount of light for each shot Guide Number: 99 feet (50mm @ ISO 100) Bounce and swivel zoom head allows versatile reflection for difficult lighting conditions Compatible with all Sony Alpha models including: A100, A200, A230, A290, A300, A330, SLT-A33, A350, A380, A390, A450, A500, A560, SLT-A55, A550, 28mm-85mm zoom coverage 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