Sigma 10-20mm F3.5 EX DC HSM is an Auto Focus (AF) Wideangle Zoom lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF3 mount lenses.
Sigma 10-20mm F3.5 EX DC HSM is compatible with cameras that have Pentax KAF3 lens mount.
Max sensor coverage of Sigma 10-20mm F3.5 EX DC HSM is APS-C / DX.
Sigma 10-20mm F3.5 EX DC HSM has a focal range of 10-20mm and 2.0X zoom ratio. When mounted on a APS-C / DX format camera, it provides an 35mm (FF) equivalent of 15 - 30mm.
Sigma 10-20mm F3.5 EX DC HSM has a constant max aperture of f3.5 from 10mm all the way to the 20mm .