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Hi Malcolm
The EDGE series Back Focus for the C9.25 is 146mm according to the Celestron Data Sheet. Is 105mm correct for the C8 EDGE, as I recall the older Celestron SCT's were 105mm?
However, the 146mm measurement is from the very end of the threads of the x0.7 Reducer, which is hidden when you assemble all the components.
This is how my Edge C9.25 is set up but with all the poor weather, I have yet to test out this configuration.
Cheers
Dennis
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