Question about Edu-Science (10166) Telescope

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We have a eduscience telescope (bought several years ago) Our grandson found it our attic and states that it is missing a diagonal mirror. Where can I find one.

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Measure the hole in the focuser-- diagonals come in 3 sizes:

.965, 1.25, and 2 inch sizes.

Your scope is probably a .965 contact Surplus Shed and see if they have one:

or Telescope Warehouse:

Posted on Nov 10, 2010


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You mean the mirror diagonal like this one:

These come in two basic sizes-- 1.25 inch and .965 inch-- measure the hole in the focuser and buy the correct size.

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You don't actually need this to use the telescope. The eyepieces will fit directly in the focussing mount.

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The mirror you look into has come off

This is the diagonal mirror-- you can buy another diagonal but you will NOT like the price. We receive many complaints on this small "toy" telescope. Read this:

and here is a link showing diagonals:

Measure the hole in the telescope and buy the correct size diagonal.

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The diagonal simply slips inside the hole at the rear of the telescope. A small thumb screw secures it. The eyepiece then goes into the diagonal.

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Hello, you could add any telescope accessory or eyepiece with this Jason mercury 200x model 404. It has an eyepiece size of .965. I would recommend buying a .965 to 1.25 adapter which can be found on ebay. This would provide you a new mirror and allow more options for eyepieces which will be better quality.

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You do not need an erecting prism to view objects at night. These are used if you wish to view terrestrial objects since it turns them right side up.

If you have a reflecting telescope (it uses mirrors) it's normal to not use an erecting prism or as they are also known as star diagonals. Objects will appear inverted and that's normal. A refracting telescope (no mirrors, just lenses) will also invert the image but it is quite often used with a star diagonal to make it easier to view. There are many other types of telescopes that use a combination of mirrors and lenses.

I hope this helps.


Mar 29, 2009 | Optics

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