Contax rangefinder Carl Zeiss Jena Triotar  8.5cm f/4 telephoto lens. Serial #1890345. Made in Germany. Pre-war circa 1936. Fits all Contax 35mm rangefinder film cameras such as: Contax I, II, IIa, III, IIIa. Will also fit Voigtlander rangefinder Bessa cameras with the Contax rf lens mount. This lens can also be used on Canon R digital camera's with proper adapter that is not included. Can also be used on digital MIRRORLESS camera's like: Olympus OM-D, Panasonic GX8, Panasonic GH-4, GH-5, Fuji X-Pro3, XE-2 and Fuji XT-4, Sony a5100, Alpha a6500 and full frame Sony A-7rIII with proper adapter.Lens uses E39mm filters. Aperture range is f/4 - f/32. Minimum focus distance is4 feet or 1.1 meter. Lens is Ex/Ex+ or 8/8.5 of 10 cosmetic condition. No dings or dents. Clean glass. Non coated lens. Smooth and clean aperture blades with some lubrication on them. Great BOKEH for a three element lens. Comes with lens caps included. Nice vintage Contax rf telephoto lens. Sells with NO RESERVE at a price of $270. I have LOT more vintage Zeiss Ikon Cameras and Lenses lenses, Contax Rangefinder Cameras and lenses, Leica Rangefinder Cameras and Lenses and Vintage 35mm Rangefinder Cameras. More great buys on my other auctions, eBay Store and web page.