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Re: [ATM] convex secondary

At 2005-02-27 02:04 -0500, Jonathan Lavoie wrote:

>I know the radius of curvature for the 4 inch secondary will be 34.5 inch 
>and I know that it has to be an hyperbola but I didn't find the amount of 
>correction that needs to be done. The primary is an F3 parabola amd I will 
>not change its figure. So what figure do I need for the secondary to 
>optimize the system for imaging with a Digital SLR like the Canon 300D ?

Texereau, Eq. (31) & (32), p. 145, gives the equations for the deformations 
(conic constants) of "Stigmatic mirror combinations".  Hey, if you want to 
go whole hog for an imaging scope using them mucho $ Canons, deform the 
primary also to make an RC - Eq. (42) & (43), p. 147 (lotsa fun and a real 
challenge).

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)  

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