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Well, interesting development. Following the”85mm backfocus” school of thought, I managed to get ASiair to do a polar alignment routine at a focal length of 1784 meaning the effectiveness of the Celestron F6.3 reducer was pretty bang on at that FL. The scope is a C11.
On the down side, I found the OAG was pretty useless. Even binned x2 the ASI120MM could barely detect a star at 5 second exposures. So I’ll dump the OAG and go back to a piggyback guide scope. I have an 80mm Lumicon guidescope with a FL of 300mm. I’m hoping that’s going to be enough for guiding at the FL of 1784. Fingers crossed and tomorrow night will be the moment of truth.
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