A lens that wins favour at the telephoto end...
Pentax cameras use a 1.5x magnification factor should you need a 35mm guide, so the lens offers an equivalent of 27-82.5mm and a minimum focus of 25cm, which is comparatively short. This lens also has a small maximum aperture, stopping down to f/40 at the 55mm end. Yet, despite its budget credentials, this optic is one of the few in this category to have a hard-wearing metal lens mount, though admittedly the rest of the external construction is plastic. The zoom ring has a deep grooved rubber grip and smooth action, while the narrow focus ring allows manual focus while in AF mode. Furthermore, the lens has a focus distance scale, which is fast becoming a rarity on modern optics.
Overall, the Pentax optic shows a fairly average performance. Resolution is average, with some corner sharpness falling off. While not displaying the highest resolution in this category, it maintains a consistent performance throughout the aperture range. But where Pentax really wins favour is at the telephoto end, where all chromatic aberration is nicely controlled, though at 18mm it is a little more noticeable to the eye.