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
Secondary Mirror Size

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Marty on January 25, 2001 17:04:43 UTC

Preparing plans for a 8" f/6. I have figured the ideal secondary size to be 1.68". Please correct if in error. The problem is the supplier I plan to use has sizes 1.52 and 1.83. I understand that if I go to big I lose contrast and clarity. If I go to small I lose some field of view. I believe I would prefer the smaller field of view. Can anybody tell me about what percent of view I would lose? I guessing at about 9 percent. Is this acceptable?

Thanks

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 1994-2022 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