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On most nights I get 2.0"-2.5" and on really good nights it's below 2" - down towards 1.7-1.8". On what I consider a poor night it's +3" and then I only shoot RGB data, or even binned 2x2.
One thing to keep in mind when measuring is that FWHM is highly dependent on collimation / alignment of the optical train. At least I find that my FWHM slowly begins to suffer when it is time to re-collimate, but identifying when that happens is difficult due to the nightly differences in seeing.
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