Forget power!! The max magnification is 2x your diameter in mm so about 600x for a 12".
This will only be achieved on really rare nights, maybe one or two a year. For most nights look at working below 200x, or possibly 250x, and you will not be disappointed with the results. Clear, crisp images, what more could you ask for.
With my 8" I mainly work between 100-170x with exceptional nights supporting over 400x on the moon.
Cheers
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