Nippon Kogaku Tokyo No. 905189 Nikkor-S-C 1:15 f=5cm w/RangeFinder Camera &Case It's the only one of the original Japanese Super-Speed lenses that I do not have. I've told my wife if I buy something, the money is from selling equipment. Does not seem like real money when I think about it that way. So this one was a custom Sonnar 5cm F1.5 conversion, Canon 50/1.4, and Jupiter-3. I will follow up when the lens arrives. The photographs of the lens kept it from selling before, "could be fungus" could be reflections. Seller gives 14-day money back. I might be testing that. If the lens arrives and is "clear" as stated, I will be one happy Sonnar fanatic. There were only 300 of these lenses made, it came with the Nicca III. I have that one, came with a collapsible 5cm F2 Nikkor on it. That one was also a gamble, but no where near as much money, and not as rare as this lens. The interior haze of that one cleared out completely, took 15 minutes total. The Simlar 5cm F1.5 took a solid week to bring to fully working condition, also "rare"- but 10x as many made as the 5cm F1.5 Nikkor. Assuming it is a keeper- will get an image archive up for it. http://www.pacificrimcamera.com/nhs/50f15/50f15.htm A great article by Robert Rotoloni on the 5cm F1.5. The lens that I took a gamble on is the 189th made. The Simlar 5cm F1.5 that I restored several years ago was 74th of about 3000 made. THAT lens has a unique optical formula, perhaps the first new design done in post-war Japan.