Overview

The Pentacon 30mm f/3.5 is a compact, all-metal lens with smooth focusing and aperture rings, though the aperture ring is unmarked. Optically, it offers good center sharpness from f/3.5, with corners improving by f/5.6-8, but suffers from moderate distortion and lateral chromatic aberration. Its main weakness is strong field curvature, making it best for flat subjects or stopped down. It suits users seeking a small, affordable wide-angle for M42 mount, especially on crop sensors where field curvature is less problematic.