Here's an interesting polar plot that shows seeing versus wind direction. Northerly and easterly components are generally bad for seeing. Southwest is the most common, and it's good. http://www.lowell.edu/Research/NGLTbak/giffiles/t.gif > But it is now closing to down around 0".65, so in the Pronto it was > not any more than "maybe oval", even at 250x(!). That requies a 2mm eyepiece in a Pronto! 10mm eyepiece and a 5x Powermate? I once looked through my Pronto at 500x using a 4.8mm Nagler and the Powermate. It was the largest perfect star disc I had ever seen, with an apparent size of about half that of the Full Moon. Tom -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.
