Article View: sci.astro
Article #3436Re: research grade vs. commercial grade
From: Dierick Dominique
Date: Fri, 22 Jan 1993 09:18
Date: Fri, 22 Jan 1993 09:18
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Some years ago Meade sold the "Research Grade Newtons". They featured rotating tube, 2 inch focuser on heavy-duty highly polished equatorial mounts. I had one 10 inch about 12 years ago and sold it when I went to live in the city. Recently by accident I found the same scope back (!) as a donation to our public observatory... We tried it out on Saturn and it was still giving magnificent images of the planet ( better then a Celestron 10 inch ). A friend of mine still has a 12 inch Research Grade in his observatory. We had the mirror tested 3 years ago with the Caustic test and it came out with 1/20 lambda and a very smooth figure - excellent thus. The only drawback with these telescopes is that although Meade clames "heavy duty mount", the mount is good enough for the 8 inch or 10 inch, but is too flimsy for the 12 inch. You need to fix the declination motor attachment ( if there is one on the mount ), because that was the major weak point. Another drawback is if you plan to do deep-sky photography. You cannot alternate for visual use and prime focus photography without moving the primary mirror cell ( extra holes are pre-drilled). You could however fix this by buying or making a new low profile focuser for the telescope. Hope this helps. Dominique
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Newsgroups: sci.astro Path: arc1-ca.pugleaf.net!sparky!uunet!haven.umd.edu!decuac!pa.dec.com!rdg.dec.com!brsux0.bro.dec.com!dierick From: dierick@brsux0.bro.dec.com (Dierick Dominique) Subject: Re: research grade vs. commercial grade Message-ID: <1993Jan22.091813.19411@rdg.dec.com> Lines: 27 Sender: news@rdg.dec.com (Mr News) Reply-To: dierick@ketje.enet.dec.com Organization: Digital Equipment Corporation, Brussels References: <1993Jan20.211839.27984@zip.eecs.umich.edu> <1993Jan21.191712.12358@gov.on.ca> Distribution: na Date: Fri, 22 Jan 1993 09:18:13 GMT