Overview

The SMC Pentax 150mm f/4 is a compact manual-focus prime lens offering very good central sharpness from f/4 to f/8, with edges good at f/4 and very good at f/5.6. Chromatic aberration is well controlled, and bokeh is pleasant, though hexagonal highlights appear when stopped down. Build is compact, with effective multi-coating minimizing flare. It suits portrait photographers seeking a sharp, portable telephoto with smooth rendering.