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I'll try explaining, but I have ZERO clue which bayonet ring is which.
One of the bayonet rings is attached to a Tak adaptor (permanently it seems), and that thread at the telescope side is M53.
Another has a FEMALE T2/M42 thread on the back telescope side.
The other has a conical section with a MALE C thread and an adaptor to male T2/M42.
The conical one would appear to be a camera lens to CCD adaptor.
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