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I need to know about my telescope optrex information . the name on my telescope is exactly\; telescope OPTREX OT 525 astronomical telescope acromatic coated lens F=700 D=60 . but when I look

When I look on the web it s does not give me the same name its say misspelling and shows OPTEX but that s not what is written on my telescope I don't know where to look to get more information about it I need answer for this one cause now I completely lost I need to find the wright eyepiece (90 degree ) its lost need to find one thanks for the answer you will give me

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Optrex did exist but was bought by Koyocera and has disappeared. Optex is an unrelated supplier of security sensors.

From the information you give, you could buy a right angle prism, erecting type, which allows daytime use as well, like this

http://www.optcorp.com/os-d125ei90-90-erect-image-diagonal-1-25inch.html

and a couple of eyepieces suited to the scope

http://www.optcorp.com/meade-12-4mm-series-4000-super-plossl-eyepiece-1-25.html

http://www.optcorp.com/meade-26mm-series-4000-super-plossl-eyepiece-1-25.html

Posted on Apr 14, 2015

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Looking for a manual for the Bushnell Astronomical Reflector telescope


http://www.retrevo.com/samples/Bushnell-Telescope-manuals.html

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Upside down image


Astronomical telescopes show a upside down image. For terrestrial use, you can buy a erect image eyepiece. They are not made for astronomical use since they reduce the light and contrast.

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A lens is missing


This telescope uses 1.25 inch eyepieces. Comes originally with a 20mm and a 4mm (probably cheap modified acromats) The 4mm would exceed the maximum practical magnification. 50x per inch. Many eyepieces available on Ebay and telescope vendors. If the 20mm is missing, buy a 20mm Plossl. I prefer other designs focal lengths under 12.5mm because of the eye relief. Agenaastro makes great, inexpensive ($55). I like the Sterling Plossls from Smartastronomy too Eyepieces for planetary viewing I suggest the 5.2mm for your high power or a TMB planetary (Astronomics has them for $50 Get the 5 or 6mm

Clear Skies!

Oct 04, 2012 | Bushnell NorthStar 78-8831 (525 x 76mm)...

1 Answer

Image is crooked how do I straighten it out?


All astronomical telescopes show upside down and or inverted images it is completely normal.

Nothing is wrong with the scope as their is NO up or down in outer space.

Sep 10, 2011 | Bushnell NorthStar 78-8831 (525 x 76mm)...

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First time telescope - after assembly, view through lens is upside down.


All astronomical telescopes show upside down images-- it's normal. NO up or down in space!

Read my tips on my profile page-- especially the Frequently Asked Questions TIP.

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1 Answer

Every thing is upside down how do I correct this??


All astronomical telescopes have upside down images. It's normal, nothing is wrong with the scope.

You can buy an "erecting prism" to invert the image right side up. Here is one:
http://www.astronomics.com/main/product.asp/catalog_name/Astronomics/category_name/EDNECFUVSRWS8KLNTU5E38XSE1/product_id/6329

These can also be found on amazon.com

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1 Answer

I need replacement lenses for my Bushnell 78-9003. what should i get and where is the best place to purchase them from Mark


You mean an eyepiece. There are many on-line retailers. Here are two:

http://www.agenaastro.com/Telescope-Eyepiece-s/3.htm

http://www.astronomics.com/main/Eyepieces_Barlows.asp/Eyepieces/Barlows/catalog_name/Astronomics/category_name/W0TJVNHC31F98LJ7AR2H5NE375/Page/1

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When viewing everything is upside down.


Yes, all astronomical telescopes show images upside down. There is no up or down in space.

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1 Answer

View upside down


There is nothing wrong. All astronomical telescope show object as upside down. There is no up or down in space!

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