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Old 17-04-2018, 11:45 AM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
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I think you are only partly correct - corrector plate removes the SA, but for cassegrain focus only....

Lens system for hyperstar is (I think) SA, coma and field corrector for prime focus. Those things are never strictly separate from each other...
Image from CN illustrates this very well - it was taken in prime focus (secondary removed) and SA is obviosly dominant.

Last edited by bojan; 17-04-2018 at 12:07 PM.
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