Question about Orion SkyQuest XT12 Classic Dobsonian Telescope

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Gluing the mirror back on the mount

I have a 1995 Coulter 8-inch Dobsonian. Every year I clean the mirror very carefully. This year I cleaned the mirror as usual. As I was going to a star party, the 8 inch mirror came off the particle board base. It looks like it was attached with hot glue from a glue gun.
What is the best way to re-attach the mirror. I love this little Dobbie of mine. It is my favorite of my four scopes.

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A better solution would be to buy a commercially available mirror holder and mount this in the bottom. On these the mirror is held on the edge by clips --

http://www.amateurtelescopemaker.com/cp.htm

Posted on Jun 28, 2009

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I am looking to buy a telescope for my husbands 50th b-day and fathers day. How do i go about choosing one?


Read these two articles-

http://texasastro.org/telescope.php

http://texasastro.org/mounts.php

A 6 inch or 8 inch Dobsonian mounted reflector is what we usually recommend for a beginner. Like this one:

http://www.telescope.com/Telescopes/Dobsonian-Telescopes/Classic-Dobsonians/Orion-SkyQuest-XT6-Classic-Dobsonian-Telescope/pc/1/c/12/sc/13/p/8942.uts?refineByCategoryId=13

Jun 04, 2011 | Optics

Tip

Buying your first telescope


So you got the Astronomy bug or a young child and you want to buy a telescope. Here are some suggestions:

1. Never buy a telescope from Wal Mart or CostCo, or Ebay unless you know EXACTLY what you are buying. Most of the scopes on Craigslist.com are also junk or toy telescopes. (I have bought two telescopes from craigslist.com; BUT I knew exactly what I was buying!)

2. Do NOT buy an equatorial mounted scope as your first telescope. You must polar align the scope to use it, and most cheap low cost EQ mounts are shaky and not actually built to support the telescope. Can you find Polaris, and point the EQ mount toward Polaris? Unless you polar align an EQ mounted telescope, it cannot be used!

3. Locate a local Astronomy club and attend their meetings and star parties. You will get to look through the member's telescopes and ask questions. Do this BEFORE you buy your first telescope.

4. Usually we recommend a small Dobsonian mounted reflector as your first telescope. See this web site: http://www.telescope.com/control/dobsonians/classic-dobsonian-telescopes Try to buy one that is at least 6 inches in aperture. An 8 inch Dobsonian would make a great beginner telescope! The 4.5 inch makes a good child's telescope.

These are easy to use and POINT at objects in the sky, and you get the largest aperture for the least amount of money.

5. Buy several Astronomy books. For example, "Turn Left at Orion", and "Nightwatch". Read these before you spend your money. Also download a free monthly star chart at www.skymaps.com You can also subscribe to Astronomy magazine, or Sky & Telescope magazine.

6. NEVER buy a telescope that advertises MAGNIFICATION. This is the least important quality of a telescope, which is made to gather the light from dim and small sky objects. 575 power magnification written on the outside of the box is a LIE! Also, the pretty pictures on the box were taken by the Hubble Space Telescope! You will NOT see color in that 70mm telescope you are planning to buy.

7. The MOUNT is just as important as the actual telescope. A cheap department store toy telescope on a shaky mount will frustrate the beginner. You CANNOT buy a usable telescope for less than about $200. Sorry but that's just the way it happens to be!

8. A nice pair of either 7x50mm or 10x50mm binoculars should be considered as your first TELESCOPE purchase, along with a Star Chart. Learning your way around the sky is a big part of the hobby. A pair of 10x50mm binoculars is almost the same aperture as that 60mm telescope you are thinking about buying! The binoculars have a wider field of view which will help beginners SEE and LOCATE more sky objects.

7. The Astronomical League has a list, by State, of Astronomy Clubs on their web site:
http://www.astroleague.org/societies/list Join a local Astronomy club!

Again, DO NOT buy a telescope until you learn a little bit about the different types of scopes (Refractor vs Reflector) and their strong and weak points for each scope design.

Here are example of scopes NOT TO BUY!

http://www.walmart.com/catalog/product.do?product_id=12538000 EQ shaky mount

http://www.walmart.com/catalog/product.do?product_id=8402684 Cheap GOTO computer scope- plastic gears

http://www.opticsplanet.net/meade-114eq-ast-model-45-f-88-equatorial-telescope-04056.html another shaky EQ mount

http://www.opticsplanet.net/tasco-50x50-telescope-and-microscope-combo-red-49tn.html I don't know about the microscope, but the telescope has the same aperture as a pair of binoculars!

http://www.opticsplanet.net/tasco-novice-402x60mm-refractor-telescope-30060402.html You might be able to see the moon and a few of the planets but with 60mm of aperture it's just too small and the mount is very shaky

Read this web site to learn about the different types of telescope designs.
http://www.texasastro.org/telescope.php

If you are buying a telescope for a child buy a 4.5 inch or 6 inch Dobsonian. If the scope is for YOU, then buy an 8 inch or 10 inch Dobsonian. Like one of these:
http://www.telescope.com/control/dobsonians/classic-dobsonian-telescopes

Or one with a computer hand controller like these:
http://www.telescope.com/control/dobsonians/intelliscope-dobsonian-telescopes

AND WATCH this video- the $800 telescope-- you will learn a lot about telescopes by listening to Andy talk about telescopes.
http://www.andysshotglass.com/800Dollar.html

Notice how much stronger the equatorial mounts appear on this video, and his final recommendation of a Dobsonian reflector as a good beginner's scope in the largest size (aperture) you can afford. Remember-- objects in the sky are VERY small. Your scope and it's finder scope must be lined up exactly pointed at the same spot in the sky; or you will not see anything!

I cannot emphasize this point enough! Telescopes have very small fields of view, no bigger than the tip of your finger held at arm's length!

Here is a free monthly star chart that you can download every month:
www.skymaps.com

Clear Skies!
TelescopeMan

RSS Link to all of TelescopeMan's Audio & Video Astronomy Podcasts

on Dec 01, 2009 | Optics

1 Answer

I have a swift astronomical telescope model no. 859 (no D). I need an owners manual and information on how to order parts. Mark J. Lanza


This is a 6 inch Dobsonian mounted reflector. They are VERY simple to assemble-- only two parts-- the base and the tube. The small finder scope goes on top. The eyepiece goes into the focuser. That's it.

No manuals exist for that brand but all of them assemble and are used in the same fashion. Here is a manual for an Orion brand Dobsonian just like your scope.

http://content.telescope.com/rsc/img/catalog/product/instructions/IN_165D_web_XT6-8-10.pdf

Dec 21, 2010 | Swift 859D (300 x 152mm) Telescope

1 Answer

How do you glue a chevy cavalier 2002 rear view mirror back on front window


they make a rear view mirror adhesive kit at most auto parts stores. step 1 mark original spot of mirror on the outside of windshield. step 2 clean old glue off with single edge razor blade carefully. step 3 use primer on windshield and mirror mount let dry for 5 minutes.
step 4 place a drop of adhesive on mirror mount and hold in position for at least 1 minute
step 5 do not istall mirror bacl on mount for at least 24 hours

Sep 16, 2010 | 2002 Chevrolet Blazer

1 Answer

How would you rate +Venture RX-9 telescope?


If you read down this page there is a manual
http://cs.astronomy.com/asycs/forums/t/30807.aspx

This is a cheaply made in China reflector telescope. It is mounted on a small equatorial mount which is too small to support the tube. It will be very shaky. These scopes appear on Craigslist after the owner determines they are really just a "toy" telescope.

You can do much better for their $249 asking price. Look at a Dobsonian telescope like one of these.

http://www.telescope.com/control/product/~category_id=classicdobs/~pcategory=dobsonians/~product_id=08942
6 inch telescope mirror, 50% larger than the Venture toy telescope

Dec 11, 2009 | Bushnell 675x5 EQ Reflector Telescope

1 Answer

My pioneer sd-533hd5 is 8-9 years old. how do i clean the lanses?


You should be able to access it from the back panel. After you remove the panel, the lenses should be mounted on a platform. If you are careful, you can manuever yourself in far enough to clean the inside of the display screen. Good luck!

Nov 02, 2009 | Pioneer SD-533HD5 53" Rear Projection HDTV

1 Answer

Confused with RA setting circle with Orion XT8 Dobsonian


An Orion XT 8 DOB cannot be polar aligned??? The mount is ALT AZ ---

You would need an equatorial platform to polar align. There are no setting circles on a stock XT??

May 16, 2009 | Orion SkyQuest XT8 Dobsonian Telescope

2 Answers

Dirty primary mirror


Nice telescope! I clean mine with a dust blaster, those canned air things.They are cheapest from Sam's Club, if you have those near you.Be careful if you decide to use swabs, you may scratch the mirror or remove the special coatings on the mirror.Try the canned air first.If you do use a swab, exercise great care.Use nothing metal.Maybe a long plastic spatula with a soft , lint free cloth.No solvents.Good Luck

Mar 25, 2009 | Meade 8" LX90 LNT Schmidt Cassegrain...

1 Answer

Problem with orion 6" dobsonian mount telescope


The small mirror is usually held on with double-sided foam tape. That tape us used, so the small mirror is not stressed by the metal fittings with temperature changes. Clean the residue from the holder and the mirror, and apply fresh double-sided mounting tape and carefully place the mirror so that the main mirror is viewed from the eyepiece position.

Aug 09, 2008 | Orion (05374) Telescope

1 Answer

Sony 52 inch hd widescreen projection tv


You need to pull the top back off be very carefull that you do not break mirror clean mirror and all 3 tube lenses this should make a diffenrents in picture.

Feb 19, 2008 | Televison & Video

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