Sigma 17-70mm F/2.8-4.5 DC Macro K Mount Autofocus Lens For Pentax APS-C Sensor DSLRS Review

The Sigma 17-70mm F/2.8-4.5 DC Macro is a standard zoom lens built for Pentax APS-C DSLRs, offering a 4x zoom range equivalent to 26-105mm in full-frame terms. With a maximum aperture of f/2.8 at the wide end, it provides more light-gathering capability than typical kit lenses, making it a versatile option for general photography, from landscapes to portraits. The lens includes a hypersonic motor for quieter autofocus, special low dispersion glass to reduce chromatic aberration, and a zoom lock to prevent lens creep. Its macro capability adds close-focusing flexibility for detail work.

This lens sits in the affordable standard zoom segment, designed to be a step up from basic kit optics without breaking the bank. The construction is reported as solid with tight controls and a durable finish, making it suitable for everyday shooting. At this price point, particularly in excellent used condition, it represents a practical choice for Pentax shooters looking to expand beyond their kit lens with a longer reach and wider aperture. However, the variable aperture means light intake decreases as you zoom in, which can limit performance in low light at the telephoto end.