Has anyway seen or tried out (or own?) the large Esprit triplet? Some details here:
http://www.skywatcheraustralia.com.a...150mm-f-1050mm
http://www.skywatcherusa.com/ed-apo-...refractor.html
http://skywatcher.com/product.php?cat=14&id=30
http://www.firstlightoptics.com/espr...o-triplet.html
It's a hefty 6" frac with lots of glass, which means a heavy OTA (14.5kg with rings), but at $A 5,600 it seems like a pretty sweet option:
http://www.myastroshop.com.au/produc...p?id=MAS-045B2
I wonder how it would go on an AZ-EQ6 GT -- I'm judging total load would be 16.7 kg (OTA+mounting + QSI-690wsg-8 + M48 FF + ASI120MM guidecam)? (The quoted loadings for the AZ-EQ6 are 25kg for visual & 18kg for imaging, so I reckon I'd be okay).