The largest scope i used....would have to be the 24" Ritchey-Chretian at the Nepean Astronomy Centre not long after it was first built....Mark Suchting did the optics for it, very nice design and the views were awesome....pity about the light pollution they now get there....fun times....There was also a 17.5" scope they had there before the 24" went in.....
Other than that i use the 14" SCT at Armidale Observatory every now and then.....
Cheers!
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