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
Amateur Multi-mirror Telescope

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Stef on February 7, 2000 19:19:05 UTC

There are some professional multi-mirror telescopes in existence, but is an amatuer version possible? As we all know, mirrors get expensive as they get bigger, more precisely the square inches per dollar gets higher as the mirror gets bigger, presumably because it's harder to make, the manufacturers sell less, etc. But you can pick up some bargain small mirrors, for example Surplus Shack has 3" f/10 mirrors at $8. Imagine 6 of these arranged in a circle, each with its own mirror cell, and each tilted slightly inwards, projecting onto a secondary mirror. Unlike a "normal" secondary mirror, this could be quite big, almost any size would do because it wouldn't obscure part of the primary, because there would be a central gap between the 6 small mirrors. The focusser/eyepiece arrangement is as normal. Six 3" mirrors have the same light gathering area as about a 7.5" single mirror, and so would be approx equivalent. The question is ..... would it focus OK? You could adjust each small mirror separately during collimation (that would be fun?), and after that it would be focussing as normal.

Obviously you'd want all the mirrors to be as exactly similar as possible. Surplus mirrors could probably achieve this, as they were probably all made for the Govt to exacting specs.

Has anyone ever tried this? I guess it could be tested fairly easily with say 2 or 3 mirrors, before committing to the full array.

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