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
Mirror Coatings.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on July 16, 2004 17:25:55 UTC

The basic answer is no. The house mirrors are all second surface mirrors and the coatings are generally silver with a copper overcoat followed by paint of some color, usually black these days.
The coating on a telescope mirror is generally done in a vacuum chamber to a fairly thin thickness and generally aluminum is used as the oxide of aluminum is transparent and won't affect the reflectivity of the surface.
Chemical silvering processes can do a good job of coating a mirror but the coating will need to be replaced on a regular basis, depending upon the tarnishing rate of silver in your area. Placing of overcoatings on silver really haven't been successful as the thickness of the coatings generally are too thick to do a decent job of letting the light reflect properly off of the silver.
Please also remember that you have done a mirror that is within something like 1/10 or better of the wavelength of light in accuracy to the parabolic shape and you need to be able to place a coating over that surface that will maintain that accuracy of surface shape.

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