Re: [ATM] Corrector/reducer for a fast Newtonian

[Michael Peck <mpeck1@ix.netcom.com>]

At 17:51 10/15/05, David Whysong wrote:

>I noticed that. I was comparing it to the Wynne corrector in his
>paper, which is only slightly better on-axis. You're right, this isn't
>so good.

Just skimming through the paper it looks like this guy is a pretty 
inexperienced optical designer. Our resident amateur designers could 
probably produce better reducer/correctors if one wants to set his mind to it.



>I've seen it, and it looks great. But can I can get an overcorrected
>mirror of this size and focal ratio from a manufacturer (on purpose)?

It's not fundamentally more difficult to do a mildly hyperboloidal 
mirror. It just takes more work. An experienced mirror maker should 
be able to do it. If he's sensible he'll charge you more for it.

I agree with Vladimir that a Paul-Baker type design is well worth a look.

Mike Peck



_________________

Michael Peck
email mpeck1@ix.netcom.com
Wildlife photoblog! http://wildlife-pix.com
Amateur telescope making http://home.earthlink.net/~mlpeck54/astro/astro.html 

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