Overview

The Topcor 28mm f/4 UV is a sharp lens at f/5.6 (SXR_Mark), but its rendering is unremarkable (SXR_Mark). It lacks an aperture ring, requiring an adapter with aperture control for mirrorless use. Adapting is challenging due to scarce adapters. Build is solid, with non-rotating filter threads. Suits collectors or those seeking a compact, slow wide-angle for adapted use, but not for those wanting exceptional optics or easy adaptation.