Quote:
Originally Posted by Wavytone
On most nights average seeing will be around one second of arc,
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This is incorrect. Normal seeing conditions are generally not 1" of arc or less. Normal "good" seeing conditions for most reasonable observing sites used by amateur astronomers is around 2" of arc. You can experience sub arc second seeing conditions at a number of sites but this is the exception rather than the norm.
The average recorded seeing at the Anglo Australian Telescope site at Siding Springs recorded over many years is 1.8"±0.05" FWHM, with no significant change from year to year.
http://203.15.109.22/astro/manuals/obsguide/node5.html
This site would generally experience seeing conditions at least as good as, if not better than most amateur observing sites. This would have been one of the determining factors in choosing it as the site to build a professional facility, as adaptive optics were well in the future when the site was chosen. Mount Kaputah is one observing site where the seeing more often than not is around 1", but this is certainly an exception not the norm.
Cheers,
John B