[bmitchell82 (Brendan)]

Originally Posted by Paddy

I found arranging airflow across the face of the primary (using Scott Tannehill's method http://www.iceinspace.com.au/index.p...63,400,0,0,1,0 ) has significantly improved my 12" GSO dobs performance. Would highly recommend such a modification!

that would be about right but the sw 10" using pyrex has a extremely low CoE so as soon as the scope has come to equillibrium with ambient temps then all i could see it doing is creating air currents that could distort the light path? am i correct or still would this be a good idea to direct a air flow accross the mirror?