The Vivitar VIV-DF-183-SON Series 1 TTL DSLR Bounce Flash uses an indirect flash to illuminate your subjects in low light without blasting them with an over abundance of bright. This innovative technique to lighting your subjects prevents Red Eye effect in pictures. The Vivitar VIV-DF-183-SON Series 1 TTL DSLR Bounce Flash has many helpful features such as flash readiness indicator within the viewfinder and a power-saving design that lets you take more pictures. A Focus beam assists the photographer in low light conditions and an automatic shutter speed setting ensures beautiful, professional images every time. Shoot better with the Vivitar VIV-DF-183-SON Series 1 TTL DSLR Bounce Flash!