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Old 02-05-2015, 08:23 PM
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multiweb (Marc)
ze frogginator

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Join Date: Oct 2007
Location: Sydney
Posts: 22,080
TBH your airy disc looks just fine. Spherical aberration would be caused by focusing on an artificial star too close to the scope so the distance between the secondary and the primary would be wrong. If your corrector was off your star test would look a lot worse so you're ok.
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