Horseman made the following largeformat lenses:
LF Topcor 90mmF5.6 - 4groups 7elements。Image circle 236mm。
LF Topcor 150mmF5.6 - 4groups 6elements。Image circle 210mm。
LF Topcor 180mmF5.6 - 4groups 6elements。Image circle 230mm。
LF Topcor 210mm F5.6 - 4groups 6elements。Image cirle 295mm。
LF Topcor 300mmF5.6 - 4 groups 6elements 。Image circle 420.
http://www.largeformatphotography.info/forum/showthr... :
The Japanese firm of Komamura Photographic Co. Ltd. is the maker of Horseman and Topcon insturments. The last line of lenses I'm aware they marketed were the Super ER series, ranging in focal length from 65mm to 180mm and the LF Topcor series which span 90mm to 300mm. The ER's were designed for their VH medium format technical camera and the Topcors were made for the 4x5 format. Some of the Topcors were available with Prontor Pro shutters. A few of the ER lenses actually covered 4x5, but only barely, so movements would be quite restricted on the front standard. Only the 300mm LF Topcor coveres 8x10, a format of camera they also produce(d). One other interesting optical item they made was a universal tele-extender that could be screwed onto the rear cell of their 150mm to give the equivelent of 300mm albeit at a loss of 2 f stops! With the appropriate adapter ring, you could use in on a number of Schneider, Fujinon, Nikkor or Rodenstock 150's as well. This device, having needing only about 60% of the bellows draw of a normal formula 300mm, would enable using that focal length with their compact 45FA camera. Hope this answers your questions about Horseman and Topcon.
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