Sigma 120-400mm F4.5-5.6 DG HSM is an Auto Focus (AF) Telephoto Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Pentax KAF3 mount lenses.
Lens Mount
Sigma 120-400mm F4.5-5.6 DG HSM is compatible with cameras that have Pentax KAF3 lens mount.
Sensor Coverage
Max sensor coverage of Sigma 120-400mm F4.5-5.6 DG HSM is 35mm FF.
Focal Range
Sigma 120-400mm F4.5-5.6 DG HSM has a focal range of 120-400mm and 3.3X zoom ratio.
Zoom Method
Rotary (extending)
Aperture
Sigma 120-400mm F4.5-5.6 DG HSM has a max aperture of f4.5 at 120mm and max aperture of f5.6 at 400mm .