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Old 20-07-2020, 12:58 PM
MarkInSpace (Mark)
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Location: Melbourne
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Using SCT thread filter on refractor

Is there anyway to use an SCT screw thread (2 inch version) on a refractor?
Is there an easy way to adapt it?
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Old 20-07-2020, 01:34 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: St Leonards, Vic
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No, not easily.
The SCT thread is a 2"x 24 tpi thread which doesn't match the standard filter threads.
I use some of my SCT accessories on my ED80. Two methods: I had a special adaptor machined (I think it was 55m x 0.75 female with the SCT external thread) this replaced the eyepiece holder on the end of the draw tube.
The other was to use a 2" male to SCT thread adaptor (it was an Orion prime focus adaptor)
Either method then allowed you fit the SCT accessories ( I used the Meade SCT flip mirror)
If it's just a SCT filter you're trying to use, what do you have to fit to the other end??
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Old 20-07-2020, 05:53 PM
kon1966 (Kon)
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Join Date: Apr 2008
Location: Villawood
Posts: 226
2 inch adapter

I had a custom 2 inch adapter made from a forum member first link below and I can screw a filter in and a sct f6.3 reducer the other end.
2nd link is a photo.



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