21mm · f/3.5
The Olympus OM-System Zuiko Auto-W 21mm f/3.5 is a compact, lightweight ultra-wide-angle lens praised for its build quality and portability. Optically, it delivers sharp center resolution at f/3.5 with low contrast, improving by f/8 and becoming very good at f/11. Weaknesses include noticeable barrel distortion, chromatic aberration, and soft edges wide open, but these are correctable in post. Flare resistance is excellent. It suits photographers seeking an affordable, small wide-angle for landscapes or street photography, especially on mirrorless cameras.