The Russar MR-2 20mm f5.6 is one of the widest and lightest lenses produced in Leica M39 "screw mount." Constructed with an aluminum barrel and small, deeply recessed glass elements, the Russar 20mm f5.6 is actually lighter than the dedicated 20mm viewfinder it is paired with. The lens is not rangefinder coupled, but the depth-of-field is so great that most scenes are entirely in focus -- this is truly the ultimate "f/8 and be there" lens. We found the image quality of the Russar MR-2 to be very impressive, with good sharpness and contrast accompanying the extreme angle of view.