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Yep, that would work. You can use the formula mentioned above to work out what f/number you are actually capturing at, the problem is that seeing changes hourly (even minutely) so it's difficult to say whether one setting gives you better results based on the images you get. Aim for f/21, but don't fixate on it too much, the maths is only approximate anyway (see image below for the "proof").
I'm not a fan of eyepiece projection, I reckon the less glass you have in the system, the better. However, I've never tried it before.
Andrew
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