I've got this lens, not looking to sell it, and wondered what design type it is. I'm starting to use it for still life shots and with some manipulation to the front element turning it into a soft focus lens. I've checked the catalogue on the camera eccentric site but am still none the wiser about what design it would be classed as. I have seen some people call it a Tessar design, but then others refute that as there was a patent problem using that design.

Apart from the fact that I have to dis-assemble it to put the f stop ring on the right way again because it reads in the reverse to the way it should I find it an interesting fast lens.

The following (poor quality compact digi) shots show that when it is wide open you can see two sets of three reflections, the third reflection at the back is extremely faint, with one of the spots having a blue colour cast (does that mean single coated?). When stopped down you can see two sets of two refections.

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