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
Understanding The Ronchi Patern.

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Greg Tedford on November 16, 2002 22:01:59 UTC

I have just finished an 8" F/8 mirror and made a ronchi tester but can't work out how to polish the parabolic shape into the mirror.

My tester shows perfectly straight lines so i have a good concave mirror but i know i need to have the bands bowing out from the centre.

How do i modify my polishing technique to achieve this?

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 1994-2020 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