Hi, I will go out and clean the mirror tonight sometime and take a close look. I will let you know what it looks like. Thanks for the information Mark ________________________________ From: Jay Eads <jayleads@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Mon, January 24, 2011 3:38:18 PM Subject: Re: [Utah-astronomy] Mirror Mark, Have you considered emailing Steve Dodds over at Nova Optical here in Herriman? I know when my daughter and I get done figuring our 8" and 12" mirrors I'll have him coat them. I believe he can test the mirror for you. How old is the mirror and how do the coatings look? Jay On Mon, Jan 24, 2011 at 2:29 PM, Chuck Hards <chuck.hards@gmail.com> wrote:
Mark, a quick look through a Ronchi grid will tell you everything. Likewise, before you part-out the Coulter, perform a star test. That will also tell you about the correction on the parabola.
I have owned many Coulter mirrors over the years, and never had a bad one.
On 1/24/11, Mark Shelton <woodturninginc@yahoo.com> wrote:
Hi, all
I have a question. I just acquired a 13.1 F4.5 Coulter dob. I am thinking about just using the mirror out of it and making my own version of a Obsession looking dob.
Is there a good way to tell if the mirror is worth the effort to make a dob built around it?
I have it out of the telescope and I can not see any defects so far in the mirror. ( have not looked really close at it yet.)
The Mirror sets in a kind of sling in the tube. Very Strange setup. I guess it was the way they made them in early 1980 or so.
If some one has a mirror cell to fit this size of mirror I would love to hear from you.
I really do not know what I should be looking for to check the mirror.
Any Suggestions would be appreciated.
Mark _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
-- Jay Eads _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com