Hello friends, I am an amateur photographer and I came accross this lens at at auction.

It has the words 'CARL ZEISS JENA' rather crudely engraved along with serial number 227780. It has no other information. I do not know what focal length it is. Aperture goes from f/4.5 to f/32. The shutter built goes from 1s to 1/150s. It has another serial number 371939 along with the letters D.R.G.M. It also has a logo that reads 'DF' or 'FD' (one letter is on top of the other). The shutter button looks like a metal pin with a polished metal ball head.

Please could anyone shed anymore light on this lens?

Thank you!

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