Sigma EF-500 DG ST Electronic Flash for Minolta Mount Designed to be used with Minolta AF 35mm SLR cameras and Digital SLR cameras Maximum guide number of 165 in feet at 105mm focal length (ISO 100) Projection angle of the flashlight is set automatically to match 28mm wide-angle to 105mm medium-telephoto 3D multi-sensor balanced fill flash function and P-TTL flash photography for Minolta Bounce flash can be tilted 90 degrees upwards and 7 degrees downward for close-ups