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12' newt:
plus:
significantly more light coming in.
its lighter than an equiv. SCT for size.
much easier to collimate.
minus:
Wind effected of long tube
focusser can end up at some weird angles if you don't pre-rotate the tube for the object.
The SCT has a longer focal length.
I've had an SCT and Ive currently got a f4.9 12 inch newt which is IMHO a clear winner for visual work, but if you think you will spend a lot of time taking happy snaps, I'd probably go for the SCT.
BTW the HEQ6pro handles either of them with no probs, but you will need an counterweight bar extention if you dont want about 5 weights on the bar.
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