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Old 07-01-2020, 09:17 AM
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billdan (Bill)
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Join Date: Mar 2012
Location: Narangba, SE QLD
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Hi Nik,

A lot of this stuff is vendor specific thats why people like Precise Parts make a fortune from manufacturing adapters.
Its not only the diameter of the focuser one has to consider but also the thread pitch that they used.

e.g

Takahashi 2.7" Focuser 72mm x 1.0mm thread pitch

Vixen VC200L Focuser rear thread 60mm x 0.75mm

GSO 8" RC rear cell 90mm x 1.0mm

Meade SCT 3.25" 16TPI

Celestron SCT 3.3" 16TPI

So your question what fits a 3 inch focuser would depend on who made it and what thread size and pitch they used.

Cheers
Bill
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