The Vivitar DF-293 TTL AF Flash is a full-featured on-camera flash designed for use with Canon cameras with E-TTL / E-TTL II metering. The DF-293 has a swivel head with 0, 45, 60, 75, and 90 degree settings; 5 levels of power from 1/1 to 1/16; a zoom function for use with 28, 35, 50, and 85mm lenses; and a guide number of 42 at the 85mm zoom position. Other features includes a red focus-assist beam for low light shooting, a reflecting plate and wide-angle diffuser, red-eye reduction, auto focus/TTL metering, and an automatic shutter speed setting.