What was this lens used for? Carl Zeiss Planar 1:4.5 75mm, 34mm thread

[Bayliss]

Sorry if this is the wrong place to post this but I can't find any info about this lens - Carl Zeiss Planar 1:4.5 75mm, seems to have a 34mm screw thread. Does anyone know what 34mm thread lenses might have been originally used for? Thanks!

 

[Donald Qualls]

That focal length is within the "normal" range for 6x6 or 6x4.5. There were a number of 6x4.5 format plate cameras, IIRC at least one with focal plane shutter. There are resources for dating Zeiss lenses by serial number, though I don't know how well they work as far back as the 1920s.

Just looked through this list, and the only thing I found that were close were the Argus screw mount at 33 mm, and the X-Pan bayonet (34 mm, but obviously not a thread mount).

 

[Dan Fromm]

Hmm. The s/n is, I think, from 1930.

OP, if you're lucky someone who has a copy of Thiele on Zeiss lenses should be able to give you more and good information. Go over to LFPF and try to attract David Linquist's attention.