Question about Celestron AstroMaster 70 AZ (160 x 70mm) Telescope

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The finderscope is showing everything upside down

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Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.

Posted on Jan 03, 2011

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2 Answers

It is the first time that I have a telescope just want to now the finder scope why is it that if you look through it its upside down. Did I do something wrong or must it be like that?


It is normal with astro telescopes to show an image upside-down (and sometimes reversed as well). This is because stars (but not planets) look the same both ways. The finderscope is usually the same.

You can get correct-image finderscopes though

http://www.optcorp.com/ae-fre80bk-80mm-right-angle-image-correct-finderscope-black.html

and for the telescope itself you would fit an erect-image diagonal prism, either 45 deg or 90 deg.

http://www.optcorp.com/os-d125ei45-45-erect-image-diagonal-1-25inch.html

.

Dec 30, 2015 | Optics

1 Answer

What is the correct way to use the viewfinder?


It is normal for everything to look inverted in an astro telescope. If you was to use it to view terrestrial, you will need to fit an erect image diagonal between the focuser tube and the eyepiece, such as

http://www.optcorp.com/os-d125ei45-45-erect-image-diagonal-1-25inch.html

This can still be used at night. The same is true for the small finder scope fitted to many telescopes. You can get a terrestrial type which can also still be used for planets etc

http://www.optcorp.com/tpo-8x50-right-angle-finderscope-and-bracket.html

Oct 10, 2015 | Optics

1 Answer

When I look through the view finder--everything is upside down???


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

I don't know of such a thing for the finder scope, you would have to buy a new finder.

http://www.optcorp.com/celestron-9x50-illum-ra-correct-image-finderscope-93781.html

Mar 06, 2014 | Celestron NexStar 114GT (269 x 114mm)...

1 Answer

Why are the images upside down when I look through the finderscope of my Celestron Telescope?


Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear.

It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.

Jan 15, 2011 | Celestron PowerSeeker 127 EQ 21049 (750 x...

1 Answer

I purchased a Edu Science 70mm Astro-Gazer telescope for my son for Christmas and discovered that the finderscope that came with it is showing everything upside down. I returned it and the new telescope...


Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear.

The main scope is probably also designed this way, but many amateur scopes now come with an erecting prism or eyepiece attachment that turns the image upright. You may have fitted this and not realise that it is an add-on, and that it is un-natural for an astronomical scope to display upright images.

Dec 29, 2010 | Edu-Science (10166) Telescope

1 Answer

Why is the finderscope showing the view upsidedown?


All astronomical telescopes show upside down images-- it's normal. There is no up or down in space. You can buy an "erecting" prism for terrestrial viewing.

Read my TIPS on my profile page.

Dec 13, 2010 | Tasco Novice 30060402 (402 x 60mm)...

2 Answers

When I look into both the finderscope and the telescope, everything is upside down. We can't figure out if it's assembled wrong or what???


Hi there,

That is just the nature of the beast with most telescopes. When there are two concave or positive lenses in play, the object being viewed appears upside down.


The ways around this are using one positive and one negative (convex) lenses or adding a third lenses. The options for a third is sometimes referred to as an erector eyepiece.

As it stands, if it's upside down, it's assembled correctly

Best regards

Mike

Nov 07, 2010 | Toys

1 Answer

When i look in the finderscope the objects r upside down but when i look in the big one theres nothing,even when i try and zoom in and out thers nothing moving


Some finders show things upside down. There is no up or down in outer space.

During the daytime focus on an object like the top of a telephone pole a good distance away.

Without moving the telescope adjust the finder scope so that the "crosshairs" in the finder are centered on the same object as the main tube. Most astronomical telescopes show upside down and reversed images.

Nov 04, 2009 | Meade (r) TeleStar Manual 60mm Refractor...

1 Answer

Finderscope image upside down & not focused if viewing past 100 yards


The upside down image is normal for astronomical telescopes. The finder usually is a fixed focus, but it can be altered for various eye types, by rotating the objective lens for focus - the cell should move in or out on fine threads.

Jul 06, 2008 | Tasco Galaxsee 45-114375 375X (375 x...

2 Answers

Barska 40070


Yeah, I am. Bought mine on eBay and it doesn't have ANY info. I don't even know how to assemble the optics. Help? If I can assemble it I'll pass along any tips I find to make yours work

Mar 28, 2008 | Barska Optics Barska AE10100 - 40070, 88x...

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