This Sigma E500 DG electronic flash is designed to work with both AF 35mm SLR and Digital SLR cameras for advanced flash photography. It has a maximum

This Sigma E500 DG electronic flash is designed to work with both AF 35mm SLR and Digital SLR cameras for advanced flash photography. It has a maximum guide number of 165' (50 meters) at 105mm focal length (ISO 100), and the projection angle of the flashlight is set automatically to match the lens' focal length ranging from 28mm wide-angle to 105mm medium-telephoto