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I don't find those maximum magnification rules of much use. I think they were designed for smaller apertures, say to 4 inches, as their light dropped significantly with power up to 200x.
For larger apertures (e.g. 8 inch), the seeing will always be the limiting factor. Only on odd occasions will you get a sharp view above 200x.
The higher magnification will in fact exaggerate any jitter due to poor seeing.
And the lower the object is to the horizon, the worse the effect.
Regards, Rob
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