Overview

The Olympus OM-System Zuiko Auto-S 55mm f/1.2 is a fast normal lens known for its dreamy, glowing wide-open rendering due to residual spherical and chromatic aberrations. It offers a narrow depth of field at f/1.2, enabling strong subject isolation with a natural perspective. However, accurate focusing is critical, and the lens suffers from yellowing thoriated glass that affects color balance, especially on digital. Stopped down to f/2, sharpness improves notably. Build is solid, but the aperture ring has full-stop detents only. It suits enthusiasts seeking a characterful, vintage look rather than clinical sharpness.