Voigtlander 21mm f/4 Black Color Skopar Screw Mt. Lens w/ Viewfinder Voigtlander 21mm f/4 Sharp Compact Leica Screw Mount Lens with Viewfinder A Great Small, Compact, Lightweight, Sharp Lens! Leica Screw Mount Lens easily adaptable to M mount with the proper adapter Easily Adaptable to All Sony NEX, M43, and Fuji X cameras with proper adapter Rangefinder Coupled