National Geographic Recent Questions, Troubleshooting Help & Support

Please do not buy any telescope that lists the magnification on the outside of the box or in the advertising. These are toy scopes. Magnification is the least important factor in a telescope.

Look around this web site for a good beginners telescope.
http://www.telescope.com/control/category/~category_id=dobsonians

You will NOT find parts for that telescope --- try a hardware store for simple missing parts like screws and nuts.

You won't find a manual for that small telescope --- however Meade probably has one similar to yours-- go here and download a manual for free-

http://www.meade.com/manuals/index.html

Yes all astronomical telescopes are upside down! No up or down in space!

You can buy an erecting diagonal for about $45 from Orion Telescopes to use for terrestrial viewing.

go on google

I would recomend that you start with a low power then gradually work your way up. The best advice used to be and still is... "that for every inch of aperture of the objective should equal 50x." With advances in telescope technology this is still is a good rule of thumb.

The formula is focal length of the scope (in millimetres) divide by your chosen eyepiece (again, in millimetres. Based on my TeleVue Ranger (70mm objective) and a 6mm eyepice this is what I get. (see below).

telescope focal length: 480mm / eyepiece: 6mm = 80x magnification.

This is comforfable for observing of the Moon, Venus, Jupiter, Saturn and Mars (brilliant when it made its close approach in 2003). Mercury I have omitted is because it is always close to the Sun and I do not have it on a mounting which has setting circles.

However, if I add my 2.8x Klee barlow lens then it pushes it up to 224x. But word of advice here. To use that kind of magnification the end result is awesome, but you need a perfect sky (i.e. no thermal disturbances and debris up there).

Many internet stores sell finder scopes---

http://www.optcorp.com/

http://www.telescope.com/control/main/

Here are two---

It's the nature of the way telescopes work that means all images are seen inverted. For astronomical use, this isn't really a problem.

You can buy an "image erector lens" to correct the image and see it rightside-up though.

Your small telescope will never get beyond about 100 power --- the maximum resolution is calculated as 50 times aperture under perfect conditions!

Use the eyepieces with the LARGEST numbers only and don't use the barlow.

Hi - You can download the manual by clicking the link underlined in blue below:

76AZ
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Informatica

i think the probleme is with ur gps usa package.Either It may be a corrupted one or there is certain installation probleme.
So 1st uninstall it and then reinstall it.
If ur probleme is not solved after reinstalling,then downlod another copy of gps usa from the below link

http://www.mininova.org/get/1118820