Sigma 50-100mm F1.8 A is an Auto Focus (AF) Telephoto Zoom lens with APS-C / DX max sensor coverage and it is designed to be used with Sigma SA mount lenses.
Sigma 50-100mm F1.8 A is compatible with cameras that have Sigma SA lens mount.
Max sensor coverage of Sigma 50-100mm F1.8 A is APS-C / DX.
Sigma 50-100mm F1.8 A has a focal range of 50-100mm and 2.0X zoom ratio. When mounted on a APS-C / DX format camera, it provides an 50mm equivalent of 75 - 150mm.