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Mystery Adaptor 2" EP to 49mm external thread

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Not sure where to post this but...

With my SW 130P-DS I got several adaptors, including a number of adaptors for 2" and 1.25" eyepieces.

I also got a tube, just over 2" (50mm) long. One end is clearly for a 2" eyepiece, with two knurled fixing screws, the other is internally threaded at about 49mm. I thought it might be to adapt a smaller 1.25" SW focuser to 2" EPs, but it's too big a thread, and it's too small to screw on the end of the 130P-DS focuser, which takes an externally threaded adaptor anyway (I got a spare one with the scope).

My guess is it fits the 49mm external threaded focuser of some scope, somewhere, but which one? Any ideas what it might fit?




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