Re: ATM MakNewt Corrector Figures

[Aplanatic@aol.com]

Bill Marriott wrote:

> The issue on the table at this point is the final figuring of the 
>  correctors surfaces.
>  
>  I have been viewing R1 (CC) and R2 (CX) on the knife edge tester, and am 
>  able to view the concave back-surface of the convex surface through the 
>  concave R1 surface.

I took a quick look at the Rumak corrector in R and vV on my ray tracer.  The 
Foucault test shows almost no change in RoC from the central zone to the 
outer zone for this corrector at a wavelength of 0.54 microns when R2 is 
viewed through R1.  However, other colors showed a bit larger change.  
Interesting.

Bill, can you send me or post the optical prescription for your corrector?  I 
would be happy to take a closer look at the problem.

Dave Rowe
Torrance, CA
Medium Format Astrophotography:
http://members.aol.com/aplanatic/photos/astro.html