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hello neil.
there is a certain difficulty in imaging at long focal lengths, and as others have said you ned to work up to it, become proficient a shorter focal lenths, then apply your knowledge and skills further up. long length imaging is VERY unforgiving, if you can do the short(600mm) well then think of mid range 1000-1500 then when you have mastered that move on to 2000+ lengths.
Theres nothing stopping you jumping in at the deep end but that is expensive and if you get it wrong wooops.
i currently shoot at 1500mm, that is my 4th imaging scope, im in no hurry to go longer. to image at that length has cost me in the order of 10,000+ dollars
g 11 mount, 12 inch f5 scope, 80mm guidescope, cameras x 2, 2 guide cameras, lots of software, custom made gear mounting plates and rings, cables cables and cables, dew heaters, observatory... the list goes on
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