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John, the telescope doesnt matter in this case at all.
magnification is magnification, its a result of eyepiece and telescope. A combination that gives 20x will still give 20x in a 25" SDM or a 80mm ED. In either case its not going to be very useful for planetary.
I suppose if the question is phrased in the manner of something like, what would be the ideal magnifications for OC, GC, Nebula, Planetary etc targets it might be more clear.
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