Back to Home

General 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 | Misc. Topics | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: 35mm Camera Tele Lenses Converted To Telescope?

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Kip on December 30, 1999 19:20:55 UTC

Unfortunatly the lenses you described would have a very, very short focal length. Most refractor type lenses (Achromatic) are 2 element lenses with at least a f/8 focal. The norm is between f/8 to f/11 for standard refractors. The 500mm lens would make a decent scope if it were f/8 or more. Focal ratio is the key here, f/2 or f/4 is way too short. Camera adapters for telescopes would be the way to go. Buying a standard quality refractor for astrophotography is a better way to go IF you have a camera that can do what is needed for astrophotography. Most newer cameras are not siuted for this. Good Luck!!

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 1994-2024 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