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
Re: Re: Re: Re: Well Al Tell Us How...

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Al Misiuk on February 10, 2001 03:47:19 UTC

RICK,
THESE FILTERS ARE ALL OPTICAL AND THE FINE TUNING
IS ACCOMPLISHED BY HEATING THE FILTERS TO 300-550
CELCIUS. THE PROPER MATERIALS MUST BE USED. THE
HEAT CAUSES A BREAKDOWN TOF THE CRYSTALLINE
STRUCTURE PRODUCING DENSIFICATION LEADING TO
LOWERING OF THE REFERENCE WAVELENGTH. THE COATINGS
ARE DELIBERATLY MADE TOO THICK BY ABOUT 40nm.
I FOUND MAXIMUM SHIFT TO BE ABOUT 60nm, OF COURSE
ALWAYS TO THE LEFT OR SHORTER WAVELENGTH. I HOPE
I'M NOT BORING EVERYONE.

AL

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