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
Ready To Use Mirrors

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on September 12, 2002 18:19:34 UTC

I would expect any mirror made by somebody else to merely meet the spec listed. If it says 1/4 wave, that would be 1/4 wave on the surface RMS which is not all that great.
Such a mirror would make a usable scope but not a great scope that would resolve to as good as the mirror size could do.
I consider that a mirror that is spec'ed to 1/15th wave on the wavefront to be an essentially perfect mirror for visual use by the amateur on earth. At that point, there will be only a few hours a year that such a scope will be the limiting factor to seeing the sky and that only at very high altitudes.

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