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Old 22-04-2021, 09:53 PM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
Posts: 6,980
This really is a bit of a minefield. One thing worth mentioning is that there can be some incredible seeing in Melbourne, I'm talking top shelf stuff. Take this image of 47 Tuc.
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It has been taken with a Mewlon 250 at F/10 with an ASI094 which results in 0.4"/pixel. This is about 40 minutes of 120s exposures, the final stack has a FWHM of ~1.4" with the best single exposure being closer to 1.1" seeing. That's about 3-4 pixels at 0.4"/pixel. Now 0.4"/pixel is a bit over the top but the best single sub I've managed from Melbourne as been 0.96" so that's a fraction under 1" seeing from my suburban backyard.

Don't get me wrong, I've had terrible nights of 4" seeing but my average is around 1.5-2".
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