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Ken,
Points noted with thanks. I think with the spreadsheet though the idea is to work out with the combination of the imager, guider and ONAG, what spacers (if any) do I need where to ensure the guider and imager camera are parfocal.
As you know, the moonlight focuser has a shed load of extension (and worse case, I have a series of extension tubes I can add, but I'm sure I wouldn't need to).
If anything with the additional 66mm that the ONAG gives, I would need less, not more extension from the Moonlite focuser. (Hope that makes sense!).
Oh, and by the way, the President of ASWA (Astronomy Society of WA) is trying to get me into spectroscopy. I figure one challenge at time; I want to master AP (DSO esp) more before taking a look.
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