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
Finding

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on October 28, 2002 20:13:46 UTC

That's the way to do it. The problem is that you aren't doing it with pinpoint sources and inspection telescopes to see the focus point and everything mounted to a light bench so you just aren't going to be getting the accuracy.
The formula works fine for any distance between the source, optic under test and the target. Note that the limiting case is the source being infinitely far away and the target is the focal distance of the optic.

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 1994-2021 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