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Hi Paul, It's not unusual for a smaller refractor to produce better images than a larger SCT or Newt; having no central obstruction helps, and also
the larger the scope, the more it is affected by atmospheric
turbulence, and light pollution; but given decent atmospheric conditions an 8" SCT or Mak or Newt will always show more detail than a 4" ref.
Simple laws of physics, larger diameter, better resolution.
raymo
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