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hudson_yak
Pooh-Bah
Reged: 11/15/07
Posts: 1091
Loc: Hyde Park, NY, USA
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Re: Tell me about Focal Reducers / Field Flattener
02/13/08 10:14 AM
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The crescents are normal, happens when used in an SCT too. That's what the vignetting looks like when out of focus, it just shows clearly that less than the entire aperture's rays are getting all the way through.
SCTs have spherical mirrors too, but still, seems like any device designed to compensate for their characteristics isn't likely to work well in a different type of scope.
Mike
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