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Nick,
Ask anyone who has a 6” it’s capable of imaging most DSO’s but this of course is dependant on atmospheric seeing conditions , polar alignment, tracking error, your location ( light pollution ), imaging camera type , auto guiding, exposure time and other technical parameters .....
My 6” is currently imaging 47 Tucanae a really good globular cluster while I’m inside watching the footy
My polar alignment error is 8 arc seconds using the Synscan PA routine and just a 2 Star alignment and my exposures are 60 seconds with tight stars ( no autoguiding set up tonight )
It’s your decision,but if you decide on the 8” I would strongly recommend the EQ6-R mount for future proofing ( I raised the same issue about the 6” and 8” over 2 years ago and ive been very happy with the 6” - no regrets )
Good Luck !!
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