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It's kind of arbitary ... but a ~2mm exit pupil is generally the sweet spot between magnification, contrast and image scale (obviously some objects require a wide field, and bright objects like planets (or PN) require higher magnification) ... so lets say ... exit pupil larger than 2mm is low mag ... and exit pupil smaller than 2mm is high mag...
Or put another way ~200x plus is high magnification in my book.
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