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Hi Dave and thanks for the feedback. Celestron's EdgeHD reducer does introduce CA but I too am ok with that - everything is a tradeoff. And your experience with PI's GHS reflects mine; it seems to accentuate CA. In comparison, integrating/stretching in APP seems to produce 'cleaner' looking stars without accentuated CA. That said, I prefer using PI despite the huuuuge learning curve (which you're now on too ... tis fun, eh!). Alex
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