Brent, how thick is the mirror and what is the substrate? Is the coating standard aluminum? What is the secondary size, and do you recall the fully illuminated image diameter? You ground and figured it yourself, right? Do you recall the specifics of the figure accuracy? My mind is whirling... On Tue, Oct 29, 2013 at 8:34 AM, Brent Watson <brentjwatson@yahoo.com>wrote:
139.5 inches. That is 11.625 feet.
From: Wayne Sumner <WSUMNER@dsdmail.net> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, October 29, 2013 8:24 AM Subject: Re: [Utah-astronomy] Journey to the 1.8 meter
The focal ratio of Brent's 22 inch is f6.3 as I recall. That would make the focal length about 11.55 feet. Brent, is that correct?
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto: utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Tuesday, October 29, 2013 7:47 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Journey to the 1.8 meter
I may be interested Wayne, but I recall that it was a longish f/ratio. How long is it?
Thanks,
C.
On Tue, Oct 29, 2013 at 6:56 AM, Wayne Sumner <WSUMNER@dsdmail.net> wrote:
Speaking of large telescopes for sale, I have sadly decided that after I retire at the end of this school year, I will no longer have a place to store the famous (or infamous, as the case may be) 22 inch Brent Watson Dobsonian. It is currently being stored (and used) in the observatory at my high school, but I just don't have room in my already crowded garage. I'd be willing to sell it for what I paid Brent for it: $750! I'd be willing to deliver it to northern Utah locations. Anyone interested? Wayne Sumner
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