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Re: [ATM] Off-axis Newt
Saturday, January 28, 2006, 1:08:58 AM, you wrote:
TAC> After following several links from recent discussions here, I'm just about
TAC> convinced I can make a good toroidal mirror. So, I'm now contemplating
TAC> converting my 16" f/5.4 Dob into an unobstructed scope. I've seen several
TAC> examples of replacing the centered flat secondary with an off-axis toroidal
TAC> secondary, but no general method for determining the prescription for a
TAC> toroidal secondary to match a given paraboloidal primary. Any ideas?
TAC> * Best regards, Bob
TAC> *
TAC> * * *
TAC> * *
TAC> _______________________________________________
TAC> ATM mailing list http://www.atmlist.net/
Hello Bob!
I think you need tct.exe. As I remember this program can design an off
axis Newtonian for you. I have made two YOLO-s and I designed them
with tct.exe. But that was years ago.Now I use my 9" YOLO that
performs beautifully. I have the program, just I have
to search it, on my archive CD collection.
One note it is not too easy to make a toroid for YOLO, but the toroid
for an off axis Newt. is harder job, because of the great diff.
between the two Radii.
--
Clear skies!
Attila Schné
mailto:yolo@chello.hu
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