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yeah the 30D is pretty much of the table do to age and technical limitations.
im not sure how to calculate the effective f number,
the scope is f4.72 according to the label. 1200mmx254mm (SW 10" collapsible Goto), i assume the barlow adjusts this somewhat
Quick reading says this would be about f9.4 so id be looking at a 4x barlow to get close to 20...
that would make the moon rather huge, but jupiter would be looking good
For the moon, the bintel calculator says about 0.3 reducer would be needed.
Last edited by TwistedRider; 15-04-2020 at 04:50 PM.
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