Can someone identify this mount?

jpentecost

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Sep 11, 2011

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19

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Henley-on-Th

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35mm

• Jan 21, 2023

• #1

I found this adapter in a box of "stuff" and the other end is a regular M39 mount but the thread is reading at about 30 1/2mm which would say 31mm or so in my mind ... Is this possibly a darkroom item ? I remember a Gnome Enlarger as a child having a smaller than M39 Mount mount ..

 

gone

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Jun 14, 2009

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gone

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Medium Format

• Jan 21, 2023

• #2

It could possibly be used for extension tubes? That 31mm size is pretty unusual, I got zero hits on google by searching for enlarger lenses w/ that size threads. All I saw was a 31mm lens to Series 6 adapter, but that looked to be OD, not ID.

 

Ian Grant

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Aug 2, 2004

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23,266

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West Midland

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Multi Format

• Jan 21, 2023

• #3

My early post WWII Gnome enlarger has an M39 thread. Schneider Componon lenses pre the S series had a smaller mount and came with M39 adapters. I acquired a Wray 50mm recently and that is a smaller threadmoint.

Ian