Mir 37 1B   (37mm f2.8)

     In preliminary testing I found the Mir 1B to be sharp, especially from f4, with low distortion, excellent color rendition and nice shadow detail. The lens is prone to flare; use a lens hood.  Chromatic aberration was minimal.  Focusing is smooth and precise.  The aperture is almost circular and stepless, which is a nice feature when shooting video.