Overview

The SMC Pentax-M 75-150mm f/4 is a compact vintage zoom with very good central sharpness across the range, especially at 75mm where edge-to-edge sharpness is remarkable. Chromatic aberration is well controlled, and bokeh is pleasant, though hexagonal highlights appear when stopped down. Build is metal and glass, weighing 465g, with a sliding hood that offers limited flare protection; SMC coatings are effective. It suits photographers wanting a single lens covering classic portrait focal lengths with good optical performance, but manual focus and slower aperture may deter those seeking modern convenience.