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

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Overshot Radius Of Curvature

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Walt Hamler on May 18, 2000 19:59:32 UTC

I`m working on a 6" as a long fl, wanted 70~72"fl.
Got sagitta down to .025 and started working through the grits. Finished the 120 and checked fl by imaging sun on wall and measuring. Came out to approx 66"!! Worked tool on top with 120 for two wets, did all of 220 tool on top, checked again and still 66~67. Worked 320 and 500 mirror on top, just checked and still 66 approx. I didn`t expect the fl to come down that quickly, as it was in the high 70`s low 80`s at the .025 sagitta. Any suggestions? I`ll stay with what I have, no big deal, but never missed one that much before!
Walt Hamler

Follow Ups:

Login to Post
Additional Information
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2023 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