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Old 04-04-2013, 12:35 PM
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Merlin66 (Ken)
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Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
The easiest and best way is to take some sample exposures and measure a few star images FWHM sizes.
I use AstroArt5, but I'm sure all the other "suspects" can do the same.
Knowing your focal length/ plate scale you can get a good estimate in arc sec.
Here in Melbourne Subs I usually have seeing around 3 arc sec.....
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