Sigma 18mm - 125mm f/3.5-5.6 DC Autofocus Zoom Lens for Pentax Digital SLR Cameras.

This zoom lens was exclusively* designed for use with digital Single-Lens Reflex (SLR) cameras and has 6.9 times high magnification zoom ratio.

A Special Low Dispersion (SLD) and two pieces of aspherical glass elements produce high level of optical performance through the entire zoom range and alsothis has resulted in a compact, lightweight lens that features a length of 77.7mm (3"), maximum diameter of 70mm (2.7"), weight of 385gr (13.5oz) and filter size of just 62mm

The new lens coating reduces flare and ghost, which is a common problem of digital cameras and also creates an optimum color balance

This lens has a minimum focusing distance of 50cm (19.6") at all focal lengths and has maximum magnification of 1:5.3. It is equipped with inner focusing system, since the front of the lens does not rotate, "Petal-type hood" and a circular polarizing filter can be easily attached and used. This lens is also equipped with Zoom Lock Switch that eliminates "Zoom Creep"

*35mm or APS SLR film cameras should not be used or image cut-off or vignetting will occur