Is it a Nikon 5x for example? Or maybe an Olympus? Olympus has the red circle more towards the nose though:
https://www.ebay.com/itm/254650991556?h ... SwG-1W0Ssk
What 5x objective is mount inside this WYKO Michelson Interference adapter?
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Re: What 5x objective is mount inside this WYKO Michelson Interference adapter?
Probably a 45mm parfocal Nikon infinity CF objective, from before the CFI60 line.