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
Waht Is

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on October 27, 2002 20:47:52 UTC

THe minimum is the distance that is produced by the angle of the top of the focuser tube away from the scope opening when the focuser is fully in to the bottom of the focuser towards the opening of the scope. The idea here is to mask off the light that may be coming in the scope from being able to hit the EP without having to do a bunch of bouncing about to get there. Every bounce takes a lot of the light intensity from the beam and that reduces the light that survives to illuminate the image you are seeing in the EP.

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