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I do a fair bit of drizzling and I am imaging at 1.158"/pixel. Depending on wind direction (amongst many other factors) I actually get some quite reasonable seeing in Melb some nights. The best I've seen has been 1.6" seeing but that didn't last long, routinely closer to 2-2.5".
I personally have found that even if you're at a FWHM of 2 it is beneficial drizzling as it makes processing considerably easier, more computer intensive but easier to draw out information.
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