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I have the 102 f/10 and its not a bad little scope. At 500mm f/5 though I'm wondering what the chromatic aberation is like. While not objectionable in mine, at that short FL it may be more obvious. As for the 80ED, mine gets far more use than the 102, if only for the much better focuser, the R&P on the Celestron is a bit rugged though it can be improved. The views through the 80 definately show much less CA, and would want to for the price comparison.
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