Question about Bushnell NorthStar 78-8846 (675 x 114mm) Telescope

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Inverted image Hello, when looking thru the lens of my 78-8846, land based images are upsidedown. Is this normal, or has something not been put together properly. Thanks

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All images in astronomical telescopes are upside down and reversed-- this is normal. There is no up or down in space. Reversing the image just adds more GLASS to the light path.

Posted on Dec 28, 2008

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Posted on Nov 15, 2008

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Astro telescopes normally do show an inverted image, since for most purposes this does not matter. For terrestrial viewing, such as thru someone's window, you can buy an "erect image" or "correct image" prism which gives an upright image.

http://www.optcorp.com/telescope-accessories/optical-tube-accessories/diagonal-prism-eyepiece-holder.html?a_diagonal_design_f=1090

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It is normal for astro telescopes to show an inverted image. It may seem odd but this is the case. It does not matter when viewing stars, but occasionally it is a problem eg for lunar viewing.

Therefore, and for land "terrestrial" viewing, you can fit in an "erecting" or "correct-image" prism

http://www.optcorp.com/open-box-orion-45-correct-image-prism-diagonal-1-25inch-07216-7037.html

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Hello, I m using the 60700 Telescope but the image i see in lens is very blurred, i assembled my telescope as per Manuel instruction but still i see upside down image with blurred effects. I tried several...


All astronomical telescopes show upside down and or inverted images-- it's normal nothing is wrong. You are applying too much magnification. Do not use the 2x barlow-- and start practicing how to focus using only the eyepiece with the largest number written on it which is your LOWEST power.

You can practice focusing during the daytime on a distant object like a telephone pole or a building.

www.telescopeman.org
www.telescopeman.info
www.telescopeman.us

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Most astronomical telescope show upside down images-- no problem as up or down do not exist in space!

You can buy an "erecting" diagonal for terrestrial use.
http://www.telescope.com/control/product/~category_id=diagonals/~pcategory=accessories/~product_id=08787

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I'm not sure what type of telescope this is (refractor, reflector, etc.) but it's normal for most telescopes to have inverted images. There is no up or down in space so it doesn't really matter when you view an astronomical object. You just want to keep that in mind if you use a moon map so that you can get the correct orientation. However, you can get moon maps with inverted images.

If you wish to view land or terrestrial objects you can purchase an image erecting prism to turn everything right side up. Depending on the telescope it may reverse the images from left to right when it does this.

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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.

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Bushnel North Star


No you do not have anything wrong. When ever light is passed through a lens it is inverted. Binoculars, and land viewing telescopes use a special lens combination or "erecting" prism to flip the image for you. The problem with that is it reduces the amount of light that passes through the telescope. It's not an issue for land viewing because these things tend to be close and bright. For astronomy objects are so faint that you actually get a better view when things are upside down.

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