ATM Forum Message | |
| Forums: |
Atm ·
Astrophotography ·
Blackholes ·
Blackholes2 ·
CCD ·
Celestron ·
Domes ·
Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem |
|
|
|
|
||||
|
|
||||||
Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place... The Space and Astronomy Agora |
| Cassagrain For A Beginner?
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Joseph K. Daugert on July 12, 2001 20:53:57 UTC |
I've had a Celestron 8" schmitt cassagrain for about 16 years now, and I guess it's a pretty good all around scope, but it just leaves alot to be desired for my planetary viewing. I'd like to build a 12 inch cassagrain with a higher f ratio. 15 or better. Just a couple questions to start with. How much more difficult is it to build a classical cassagrain compared to a Dahl-Kirkham? How noticeable are the inherant visual flaws in a Dahl-Kirkham at higher f ratios? And how high an f ratio can I go before the secondary would be to small to expect a beginner to grind well? Thanks for your input, and expect me back with tons of questions once I get my copy of Texereau's book. |
|
| Additional Information |
|---|
 |
| About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy |
|
Unless otherwise specified, web site content Copyright 1994-2024 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 |