Brian; I have never had an evening at the telescope where the seeing could not be predicted by the naked eye scintillation of the stars. In either direction. By that I mean I have never had a night when the twinkling was minimal and the view in the scope was poor or a night where the twinkling was obvious and the view was steady. So, I will continue to "believe" in this myth. Have you often had nights where the telescopic seeing is the "reverse" of the naked eye view? Steve Author "Deep Sky Observing--The Astronomical Tourist" Saguaro Astronomy Club website www.saguaroastro.org -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.