Re: [ATM] Re: Aplanatic Gregorian

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

lou krajci wrote:

>>From: Michael Lindner <mikell@optonline.net>
>>    
>>
>
>  
>
>Do such compensating Gregorian (non-aplanat) designs exist?  Are they easy
>to fabricate/test...or do you end up with very aspheric mirrors that make it
>too much trouble, etc.?
>
>Thanks in advance.
>
Let's see if we can make this easier.  I have modified the html:

    http://users.rcn.com/rflrs/twomirrors.htm

to perform the calculations.  For a Gregorian, enter a negative f or 
f/#  value
and then negative values for D2, T, P or M as needed.  The resultant
Ritchey-Chretien version is aplanatic.

If you have any problems running this, please let me know.

>Tom Krajci
>Albuquerque, New Mexico
>
>  
>

_______________________________________________
ATM mailing list http://www.atmlist.net/