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I suspect we (or at least I) get better seeing than people assume is typical in Australia. I routinely get 1.8" FWHM L subs with my Esprit 120. Using Ray's handy spreadsheet I can reverse-engineer an approximation of the seeing at my site based off:
0.12m aperture
0.6" RMS guiding
1.8" FWHM stars in the resulting images
= ~ 1.28" seeing
Again using Ray's handy spreadsheet, upping my aperture to 0.2m would reduce the FWHM of stars in the resulting image to approx. 1.63"
I realise these are approximations, but don't know exactly how accurate Ray's formulas are. I do know the aperture of my scope, typical RMS guide errors and resulting star FWHM with confidence though.
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