Back to Home

ATM Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Amateur Telescope Making | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
RE: What Should I Build Now?

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on March 17, 2000 18:28:50 UTC

Could you measure the focus accurately as you can (set up the Foucault test and test the mirror) and verify that it is indeed a parabola rather than a spherical mirror? If so, I can calculate what you need to do to do a Gregorian telescope with that mirror. I have a rough design already together that will mean that you will need to make a mirror with an eccentricity of about .6 of a parabola and about 2" in diameter. It will also mean that you will have to put a hole in the middle of the big mirror (a lot easier than you think) so the light can get out to the back. If you`re interested, let me know bobmay@access1.net .

Follow Ups:

Login to Post
Additional Information
Google
 
Web www.astronomy.net
DayNightLine
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2022 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins