Overview

The Olympus OM S Zuiko 28-48mm f/4.0 Auto-Zoom is a compact, lightweight (300g) wide-angle zoom from the 1980s, built for the OM system. Optically, it offers good sharpness from f/5.6, with slightly soft corners wide open at 28mm. Weaknesses include significant vignetting at 28mm, moderate barrel distortion at the wide end, and a long minimum focus distance of 0.65m (28mmf2). Chromatic aberration is minimal and flare is well-controlled with the hood (28mmf2). Build quality is solid, with smooth manual focus and a rotating front element. It suits photographers seeking a compact, versatile walk-around lens for landscapes or travel, especially on mirrorless cameras with an adapter.