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
How Do I Find The Correct Mirror Distances

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by on October 23, 2000 01:47:08 UTC

Hi, My name is Larry Alvarez. I am building a reflector telescope and I am having a little trouble figuring out what distance I should place the mirror surface of the primary mirror (large one) from the secondary mirror (small diagnol). I have been unable to correctly calculate the distance. Every formula I find online gives me different results. Here are the specs of my scope.

Tube length: 38 inches
Distance from center of focuser to top of tube 6 1/4 inch.
Diameter of tube: 10 1/2 inch
Tube thickness: 3/8 inch
Primary Mirror specs: 8 inch diameter,1" thick, f4.5
Secondary Mirror spec: 1.83" , oval diagonal mirror
I have already mounted the focuser and secondary mirror (diagnol mirror) based on one of the first formulas I tried but I have yet to mount the primary mirror (8 inch diameter mirror). Any help anyone out there could give would be most welcome. Thanks a million,

Larry Alvarez (

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 1994-2022 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