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Re: [ATM] Elliptical mirror



On Tue, 23 Mar 2004 13:58:42 +1200 "Malcolm Macdonald"
<toliman@wave.co.nz> writes:
> I need some help with figuring an elliptical secondary for a 
> Gregorian
>

Testing a Gregorian seconday should be easy as it's a null test with the
light source at one focal point and the knife edge at the other.  Use a
small light source such as the end of an optical fiber at the focal point
nearset the primary and the knife edge at the other.  "What you see is
what you get" which should make it fairly easy to figure.  As to the
strokes used, the same that you would use to parabolize.

Jarvis Krumbein

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