Constant f/3.5 Sigma ultra-wide for Pentax APS-C with HSM AF, the best-specified ultra-wide zoom for the K-mount system.
The Sigma 10-20mm f/3.5 EX DC HSM is an APS-C ultra-wide zoom for the Pentax K mount. EX = Sigma's premium build quality. DC = APS-C format. HSM = Hyper Sonic Motor. Pentax K mount.
f/3.5 constant aperture. 10-20mm ultra-wide zoom (15.5-30.5mm APS-C equivalent). HSM AF. EX build quality. DC (APS-C). At approximately 520g. Pentax K mount.
The Sigma 10-20mm f/3.5 EX DC provides a constant-aperture ultra-wide zoom for APS-C Pentax K cameras — equivalent to 15.5-30.5mm on full frame for architecture and landscape photography.
On the used market the Sigma 10-20mm f/3.5 EX DC is a capable APS-C ultra-wide zoom for Pentax K. Condition checks: front element, HSM AF speed, zoom ring. Pentax K mount.