when I look out my telescope things are upside down ?????

Answer 1

Ok here is the real reason - a lens allows light to pass through, if the lens is convex (like telescope lenses) the light forms an image on the other side of the lens. The nature of this lens is the image is inverted. The point where the image is in clear focus to see is the focal length away from the lens.
Now this image is very very small so we use the eyepiece to magnify the image. In astronomy scopes up and down is not really important as to add a lens to correct this would add weight and money. If you place the star diagonal straight up so you are looking straight down the image will be right side up. The prism in the diagonal re-inverts the image.

Answer 2

Images Through A Telescope

Answer 3

In a refracting telescope -- a telescope with a lens -- the image will be upside down. If you also have a mirror near the eyepiece to make the viewing angle more comfortable, the image will be mirror reversed as well.

You can correct this with an erecting prism. See here, for example: http://www.astronomics.com/main/Image_Erecting_Prisms.asp/catalog_name/Astronomics/category_name/EDNECFUVSRWS8KLNTU5E38XSE1/Page/1 , and there are many other suppliers. If you have a very inexpensive telescope, you might prefer to just live with this problem rather than shell out $50+.

Answer 4

This is normal for most telescopes, because of the way the images are formed. In astronomy, it doesn't make any difference that things are upside down, and adding prisms or lenses would cut down the light transmitted. For terrestrial observation, use an erecting prism in a refractor, or stand with your back to the object with a reflector.

Answer 5

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A diagonal will make everything the right way up but it will still be reflected left to right. To get everything in its proper orientation you need an image erector, which is often built into an eyepiece to form an erecting eyepiece. You need to find out what size eyepieces your telescope takes: it will likely be either 0.965" or 1.25". It is much easier to find accessories for 1.25", you will have to look much harder if your telescope takes the smaller 0.965" eyepieces since that size is not used on more serious telescopes. In any case, it sounds as if you have bought a cheap toy telescope: do not be surprised if a quality diagonal or image erector costs you more than the entire scope.

Answer 6

Yes, in many telescopes the image is upside down. This doesn't really matter for astronomical objects. You might be able to add an inverting prism to it.

Answer 7

Oh no, it's not just this section. Any idiot can post any rant at any time. You want entertainment, visit "alternative health".

It's because the lenses and mirrors that magnify and focus the light also "flip" the image, either horizontally or vertically. The image your eye projects on your retina is actually upside-down but your brain corrects it for you. On microscopes, the image is also flipped, so when you move the slide left it appears to move right, and to move the image up you have to move the slide down.

Answer 8

Yes, this is normal. You have a reflector which uses mirrors. There is also a telescope which is called a refractor which uses lenses.

Answer 9

Logic1812 pretty much covers it but he missed one important factor. Adding extra glass into the light path causes losses due to reflection and absorption.

Answer 10

This must be the only section in YA where people who know that they don't know the answer feel that they can put in any old opinion.

The mirror in the diagonal reverses and inverts the image. If you want a true image, you can remove the diagonal and attach the eyepiece directly to the drawtube. Assuming your scope isn't a reflector, that is.