Bower SFD290 Digital Universal Automatic Flash for Canon, Minolta, Nikon, Olympus, Pentax, and Samsung 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