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Ive been fortunate enough to experience DSO imaging with the cheapest to the best equipment. As Jase said, in the end, theres no substitute for long exposures, and to that end, the rules are well defined. Going "different" is appealing, but theres good reasons why most dont, unless your a tweaking genius (granted, theres a few) it doesnt work.
Long FL DSO imaging is all mount, mount, mount. The appropriate mount required for long exposures on a long FL, large aparture DOB would be a crippling financial experience ;-).
SCTs and RCs are used for long exposure imaging partly for the reduced load they present to the mount over a DOB/newt.
Ive been amazed over my equipment owning experience, just how important the mount is (rather than aperture). Thats where the money should be spent, a good mount and then an OTA to suit.
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