Hello: Thank you for trying to help me on this mysterious lens. The design of th is lens, does not go along with your thoughts. At the same day that I made my qu ery with you'll, I contacted Nikon USA and they did not know about it existence. Let me describe it: Short barrel (65cm). Wt.of 500 Gm (1/2 kilo). F10 to f32. S ymmetrical and multicoated but does not follow a common modern design i.e airspa ced Dagor (Plasmat) or Tessar or Heliar or double Gauss or Biogon or a modified Triplet. The front and back elements have the curvature of a "fisheye" lens that protrudes 8mm above the respective flanges. It is like the curvature of the Goe rz Hypergon but larger in diameter. Both lens caps are conical in order to acomm odate the curvature. If I want to use a filter, I have to set it on the lens hoo d. Front flange measures 63mm and the lens hood has a height of 2cm with a exter nal opening of 90mm. As you can see, the lens hood follows a wide angle design. Shining a fluorescent tube on the front and back cells, I can see 3 menisci on e ach side. Is this a modern Metrogon&Topogon? Bush Pantoskop? Harrison's Globe le ns? in other words a computer corrected Meniscus anastigmat? Today, I mount it o n my 8x10 and indeed it is a wide angle but lighter and smaller than my 210mm An gulon with the same coverage. I am going to expose a 8x10 Polaroid a la Sally Ma nn (Hat as Shutter) and see the results. Thank you for your patience. Appreciate . Best, Tito.
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