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- Newsgroups: sci.astro
- Path: 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
-
-
-
- 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
-