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Hi Shaun
Do you want to do planets/moon only, or DSO's as well?
For planets only, you don't need long-exposure modification. For DSO's as well, you will need long-exposure mod.
Definitely get the 900nc - it is slightly better than the 840k. You also need the 1.25" adapter with filter thread. Don't worry about the baffled version. You won't notice any difference on the planets.
Get the Baader UV/IR blocking filter as well.
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