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Help to identify a Carl Zeiss Jena Anastigmatlinse

Lenses & Lens Accessories - www.largeformatphotography.info
I recently acquired a great old CZJ lens and cannot seem to put a date to it. Here are the details:

Barrel had DRP 84996, which seems to be the patent for the barrel with built in iris. It has the "Carl Zeiss Jena" scrolled engraving and the settings marked in what would seem to be millimetres. I am yet to do the math to work out F stops.

The two elements at each end are marked the same "Anastigmatlinse 1:12.5 F=590mm D.R.P 56109. One element has the serial number

"No27558, the other has "No27559.

The image formed is very sharp on paper and there is not a single mark on either element, crystal clear. Iris seems a bit stiff, a bit of alcohol should clean that up nicely.

I know it is early, does anyone have any reference material, the VM seems a bit unclear.

Thanks in advance

I have just checked and there is one strong and one faint (smaller) reflection on each end


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