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 |
| RE: ??How Thick Should I Go??
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Rick Crockett on May 6, 2000 05:33:31 UTC |
Most glasses need a ratio of 1 to 6 thickness to diameter so yes 3/4" is pretty thin. The main problem is the mirror sagging from improper edge support. The full thickness mirror can be supported on its edge at just a few points. As the mirror gets thinner it nead more point of support on its edge as a sling might provide. Eventually it needs active back and edge supportif the mirror is too thin.
|
|
|
| Additional Information |
|---|
 |
| About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy |
|
Unless otherwise specified, web site content Copyright 1994-2020 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 |