Overview

The Cosinon 28mm f/2.8 Auto Wide is a manual-focus lens with decent center sharpness but soft corners, especially wide open (OpticalLimits). Build quality is basic, with a plastic barrel and smooth focus ring, though the aperture ring feels loose. It suffers from noticeable chromatic aberration and flare. Best suited for budget-conscious photographers who don't mind manual operation and can stop down for better edge performance.