Bower Digital Automatic Flash For Sony Alpha NEX-3, NEX-C3, NEX-C3K, NEX-C3K, NEX-5, NEX-5N, NEX-7 Digital SLR Cameras 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 most digital SLR models including Canon, Nikon, Olympus, Pentax, and Samsung 28mm-85mm Zoom coverage