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Connecting a f6.3 reducer to a SW refractor?

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The Orion 2" prime focus adaptor ( similar style as previous recommendation) works well, but does take up a bit of the back-focus and I found the 2" focuser didn't seem to hold it 100%.

I eneded up machining an adaptor which threaded onto the SW "silver" tube ( remove the existing SW 2" adaptor) and has a SCT male thread on the other. This gave a very tight and short adaptor.

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