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They don't fit anything telescope and aren't worth spending the money on 2 step down rings (49 to 48 and 55 to 48). I would sell them on Ebay. They aren't worth a lot but you will get a few $$$$ for them which saves them going to landfill. They are useless for astronomy IMO.
I have done that with some old camera filters and found some gratefull buyers who were looking for exactly what I was selling.
Cheers,
John B
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