Leica Summitar 5cm (50mm) f/2 collapsible rangefinder screw mount M39x1 LTM standard lens. Serial #903703. Made in Germany. Circa 1951. Perfect fit for Leica III, IIIA, IIC, IIIF, IIIC, IIF, IIIF ST or Leica IIIG cameras. Can also be used on most mirrorless digital cameras with the proper adapter. 7 lens elements in 4 groups. Use Leica L tapered filters. Close focusing from 3.5 feet or 1 meter. Distance scale is in feet only. Aperture range from f/2 - f/16. Lens aperture is the earlier version with 10 aperture blades for good BOKEH. Single lens coating. Lens is in Ex+ or 8.5 of 10 cosmetic condition. No DENTS or DINGS. Overall nice condition lens barrel. Clean glass. Front lens coating with no detectable coating marks. Nice lens single coating. Smooth focusing. Smooth working and clean aperture blades. This lens has recently been CLA'd best as possible for a vintage lens in April 2026. Vintage light weight "classic" Leica Screw Mount standard lens in good shooter condition with lens caps. Sells with no reserve at a price of $545. I have LOT of other Leica screw mount, M vintage cameras and lenses, Leica R lenses, Leica Copies, 35mm Rangefinder and Vintage and Collectibles. There are always unique & unusual items on my other Auctions, E-Bay Store and Web Page.