Mystery Nikon F adapter. Got this the other day have never seen one before.
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Posted 24 February 2017 - 06:42 PM
The Nikkor-T 10.5cm F4 used 34.5mm filters. From there, Nikon went to 40.5mm filters.
The rangefinder 5cm F3.5 Micro-Nikkor uses 34.5mm filters. There is the "F-C" Microfilm adapter to use this lens on a Nikon F, in reversed position. BUT- it would need to screw into a 34.5mm filter thread.
This is an obscure item: I'll have to dig out my Nikon/Nikkorex handbook...
Posted 01 March 2017 - 05:28 PM
One thought - it's about the right size to go around the eyepiece tube of some telescopes. There's something that looks a lot like it on page 33 here:
and I think that's what it's for.
Posted 23 June 2019 - 01:14 PM
Is it possible that the distance from the first slot on the iiner edge is actually 42mm diamter with a thread inside ? If so its most likely a telescope adapter.