I recently acquired a Zeiss/B&L 5x7 Protar Series V f/20-f/256 and wanted to know more about it. I googled it and found some information but mostly on the f/18 version. VM says very little about the f/20 other than it's "...an early lens as no focal length seems to be engraved on it." The serial number is 140xxx.
I would like to know more information about it such as when it was made, what focal length it was sold as (I can check actual FL), image circle, etc...
TIA.
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