Hi Jeff, The refractor that Poita suggested, would be fine for imaging,
but as you said that you are mainly interested in deep sky observing,
you obviously need more aperture. You state that you have had Newts
before,so would be familiar with the admitted unwieldiness; in which
case the 10" f4 on the 6 mount would work well, but bear in mind that
assembling, transporting, polar aligning, and dismantling of that rig would be time consuming. I run a Skywatcher HEQ5 PRO GOTO and an 8"
newt and have no complaints. In your case, if cost is not a limiting
factor, I would suggest a second scope for imaging, in the form of a
Skywatcher ED 80 which you could use on the same mount as your 10"
scope. The ED 80 can be picked up used reasonably cheaply.
raymo
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