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Figuring it out
I have to confess to a mistake with my numbers in previous post. The 840x was OK for the moon but the 350 for Jupiter should have been 270, which gives about 17x per inch before the start of image breakdown. Also the moons do look like tiny balls. My 12" commercial mirror (F5) is also only useful to about 17x per inch on Jupiter as well. I suppose the real question for you is this, can you test a mirrors magnification using the moon and is this a definitive test.
Cheers Frank
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