Sigma 50-150mm F/2.8 APO DC EX HSM II K Mount Autofocus Lens For Pentax APS-C Sensor DSLRS Review

The Sigma 50-150mm F/2.8 APO DC EX HSM II is a fast telephoto zoom designed exclusively for APS-C sensor DSLRs, in this case with Pentax K mount. The 50-150mm range translates to roughly 75-225mm in full-frame equivalent terms, making it a versatile portrait and sports lens. The constant F/2.8 aperture offers solid low-light performance and subject isolation, while the HSM (Hyper Sonic Motor) promises quick and quiet autofocus. APO glass aims to minimize chromatic aberration.

This is the second-generation version of Sigma's well-regarded 50-150mm design, which has been a popular choice for crop-sensor shooters looking for telephoto reach without the bulk or expense of full-frame glass. At this price point as a used bargain unit from KEH, it represents an affordable entry into fast telephoto zoom territory for Pentax APS-C users. The lens ships with caps and hood included.