I just came back from 2 days spent at Darby Falls (home to a 40cm and 50 cm dob) and then Magellan Observatory (60 cm dob F3.7 using Argo Navis in a 4 metre fibreglass observatory amongst 6 other great scopes and a few high end GE mounts and S-BIG ccd's).
It's not just raw size, its clearly focus, tracking, collimination, f-ratio and a few other very important things that matter; I've sent a detailed review of these two observatories and their respective hosts to Mike in case he wishes to display my views on each.
Bottom line - Magellan wins by a clear country mile on multiple fronts, performance, visuals, focusing, tracking and go to, facilities, hospitality, range of high end scopes / mounts / ccds, value for money - its a walkover!
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