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RE: RE: RE: Off-axis Parabolic Mirrors
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Steve Fejes jsfejes@swva.net on July 20, 2000 02:03:31 UTC |
If you keep the secondary obstruction below 15% of the diameter it helps a lot. On a long focus reflector a 12% obstruction may be possible, in which case the image quality will be great. I`ve seen graphs in books which document this, but I don`t have a web site to point you to on this one.
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