The 50 f2 Dual Range Summicron is one of the most interesting Leica M lenses with the closest rangefinder coupled focusing of any M lens. The removable "eyes" provide parallax corrected viewing in the close focus range. The flat dovetail mounting base for the eyes gives the DR has a unique appearance among Leica lenses. A popular lens in the user market, many photographers consider the DR their sharpest lens. A 50 DR had the honor of having the highest resolution ever tested by the now sorely missed American photography magazine, Modern Photography, at over 100 lines per mm.
This is a USED lens. There are signs of age and use, being sold AS-IS. There is no rear lens cap. The inside of the lens is has a scratch and marks around the edge, but it does not appear to affect the photos.