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 |
| Mirror Sphericity
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Scott Pelger on July 24, 2003 01:40:44 UTC |
working on my first 8" mirror and am trying to determine if i am ready to move on te the next grit. i am doing a pencil test (paralles lines and more perpendicular to those, then rubbing the tool and mirror (dry) together) and am noticing only a small amount of wear on the edge of themirror. the bubble distribution appears ok when i am grinding though. can i move on? does anyone do this pencil test? (ka: sharpie test.)
|
|
| 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 |