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Old 04-06-2013, 10:14 AM
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alocky (Andrew lockwood)
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Join Date: Aug 2010
Location: perth australia
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I'm sure someone will correct me if I'm wrong, but my understanding is that coma is unique to parabolic (or the various hyperbolic surfaces in the exotic RC type designs), whereas the distortion in a refractor is spherical aberration.
Either way - field flatteners for refractors and coma correctors for newts are very different designs.
Cheers,
Andrew.
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