Its zoom range covers wide-to-moderate tele, and its constant f/4 aperture is sort of fast. But optical performance at the 35mm focal length is excellent, with no vignetting at all.
Standout Spec: Useful focal-length range. You can shoot scenery, interiors, portraits, and snapshots.
Lens Test: Pentax-DA 17-70mm f/4 AL SDM AF