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I agree with what the guys have been suggesting. A good quality x2 ED Barlow and a selection of at least 3-4 good quality 2” lenses from around 5mm to 30mm. That’s essentially what I use with my 10” Dob and 8” Newtonian. This range gives you a good choice of magnifications and fields. I’m assuming that your 10” Dob is around f/5.
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