Overview

The Arsat H 20mm f/2.8 MC is a compact ultra-wide lens with barely adequate build quality, including an irregular aperture and uneven focusing ring. Optically, wide-open performance is poor with soft corners; sharpness improves significantly at f/5.6-8, though extreme corners remain weak. Chromatic aberrations and complex distortion (barrel to pincushion) are notable. It suits infrequent UWA use on a budget, but better alternatives exist for slightly more.