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Noted Leo and Thanks for the detailed explanation Pierre.
I hadn't thought about comparing magnitude. Would spotting galaxies work for that purpose? I understand that comparing stars would be ideal but I think my Interstellarum stops at mag 11. I could select galaxies between 10 and 13 magnitude and compare the reach of the 90mm, 5" and 16" in my skies to their respective theoretical limit (I don't think I've ever spotted a mag 14 object from here). Would that work or is the extended size of galaxies going to mess up the experiment?
I can then revert here for help interpreting the numbers.
PS: I unfortunately can't take my scope somewhere to compare it as it's $360 just for the return on the barge. I might as well just recoat and hope for the best rather than spend that cash.
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