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Jim Rosenstock
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Reged: 07/14/05
Posts: 3696
Loc: MD, south of the DC Nebula
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Re: Prism Diagonal
08/28/08 09:51 AM
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Interesting article.
Not really being a 'fractor guy, this is new-ish territory for me. Coupla questions:
1. So Clive, you're saying that a lot of the more affordable ED refractors have intentionally shifted the CA toward the red, which in your opinion is not such a good thing....and that a prism diagonal can help shift the CA back to the "normal" range. Is that more or less correct?
2. "Another optical characteristic of a diagonal prism is that it's naturally overcorrected for spherical aberration." I don't understand this. Please explain in a bit more detail. Thanks!
Clear skies,
Jim
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