I have here in front of me a near mint Zeiss Jena Protar 1:18 632mm barrel lens and was wondering if anyone can shed some light on just how big an image circle this lens has. I have read that the F18 Protars are the so-called Series V wide angle Protar covering an angle of 110 degrees. Is this one of them, I didn't think they made them at this long a focal length? If so, was this made for those big process cameras like the long Apo Nikkors or Artars or was it for ULF general photography? Any other info would be most welcome. Thanks in advance, Henry
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