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
Another Detail

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Daniel Johnson on April 15, 2003 18:44:02 UTC

Most Newtonian reflectors don't have enough in-travel in the focuser to allow you to reach focus with a prism inserted, though a few might. Still, there are drawbacks to long focuser tubes on Newts--they stick into the light path when racked in, and require a larger secondary mirror if focus is placed waaaaay out of the tube, as it would need to be for a prism to work well.

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