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Max magnification...rough guide, 75X~ 125X per inch aperture.
Problem is that as you magnify the image your scope captured (with it's objective & given Focal length), it becomes spread across a larger image size and thus becomes dimmer, more difficult to see details. You reach a point of diminishing returns.
Couple this with atmospheric disturbances.
You can get away (with the right atmospheric conditions) higher magnification of planets but Deep Space objects are dimmer by nature thus you need less magnification. Also wide field low magnification is more pleasing to view.
FWIW.
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