Question about Bushnell Discoverer 78-8945 (325 x 114mm) Telescope

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Bushnell Discoverer 78-8945

When trying to calibrate the telescope by zeroing in on an object 200 yards away the images are upside down. How do I fix and is there an online assembly manual I could download?

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All astronomical telescopes show upside down images. Read my Frequently Asked Questions Tip on my profile page. These scopes are made to view objects in the night sky which are very small, and faint. To erect the image would require more glass or mirrors in the optics and would further dim these objects.

You can buy an "erecting prism" to use for terrestrial viewing. Like this:
http://www.amazon.com/Bushnell-780103-1-25%C3%93-Format-Erecting/dp/B000EY2ZFK

Your scope is working just fine.

Posted on Jul 07, 2010

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Cant get an image.Is it right that the view finderimage is upside down


The image of all astronomical telescopes are upside down (SCTs are upside down and reversed). RACI (right angled, correct image) finders do produce a right-side up image. For daytime use a erect image prism eyepiece.
Follow below instructions (except 7 in your case)

  1. Get Stellarium or another fine astronomy program
  2. During the day, point the telescope at a part of the landscape about 100 yards away.
  3. Use the lowest power eyepiece (highest number) in the focal tube.
  4. Center the landscape object in the telescope.
  5. Align the finder scope so that it points exactly where the main telescope is.
  6. At night, leave the scope out to reach thermal equilibrium (about an hour for small reflectors and refractors)
  7. If the scope is on a EQ mount, polar align.
  8. Point the finder at the moon. The moon should be in the main scope also.
  9. Practice finding the moon before you start on the planets
  10. Once you are comfortable with the moon and planets, you can go for the deep sky objects

Feb 28, 2013 | Vivitar Viv-tel-76700 75x/350x Reflector...

1 Answer

Image is upside down (inverted)


All astronomical telescopes show upside down images this is normal.

You can buy an "erecting prism" to use for terrestrial viewing from many on-line retailers here is one: This will flip the image so it is not upside down.

http://www.amazon.com/Bushnell-780103-1-25%C3%93-Format-Erecting/dp/B000EY2ZFK

Jul 11, 2010 | Barska Optics Barska AE10104 - 70076, 350x...

1 Answer

I CAN NOT SEE OUT OF THE SCOPE THERE IS NO IMAGE FROM THE OBJECT


The end with the FOCUSER is the UP end. The mirror is the BOTTOM.

Like the picture in your question. The small finder scope is also mounted near the focuser as in the picture above.

You probably have the scope tube mounted upside down !

Jun 26, 2010 | Bushnell 3" Reflector Telescope w/Talking...

1 Answer

Need operation manual on Discoverer 60 MM Zoom telescope.


All of the manuals for Bushnell are located on this web site. Find your telescope model, and download a free manual.

Look down the page:
http://www.opticsplanet.net/bushnell-warranty.html

Mar 01, 2010 | Bausch and Lomb Optics

1 Answer

Should the image i see through my viewfinder be upside down?


Yes, all astronomical telescopes show upside down images. No up or down in space, and more GLASS is required to right the image. This dims those faint objects in the sky.

However you can buy an ERECTING prism diagonal to use for terrestial viewing during the day time. Here is one:

http://www.scopecity.com/detail.cfm?ProductID=1775


Dec 09, 2009 | Bushnell NorthStar 78-8890 (300 x 90mm)...

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

I lost my manual for my 60mm. zoom telescope. How do I get a new one .


Bausch & Lomb Sporting Optics were purchased by Bushnell in the 70's. Bushnell continued with the Discoverer line. Try searching Bushnell online for the product manual. They still have many PDF's of older models that carried the B&L brand on them. Thos branded Bushnell are identical to the B&L model of the same specifications and configuration.

Jul 29, 2009 | Bausch and Lomb Discoverer 78-1600...

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!

Sep 01, 2008 | Bushnell NorthStar 78-8831 (525 x 76mm)...

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...

1 Answer

How do you use the red dot finder? and when I look throught the format eyepiece everything is upside down.... Thank you Stacie


Astronomical telescopes show all objects upside down and reversed-- this is not a problem; there is no up or down in space.

The red dot finder helps you point the telescope-- focus on a distant object and center it in the eyepiece.

Without moving the telescope -- adjust the red dot onto the object. Now you can use the finder to locate objects.

Apr 13, 2008 | Bushnell Voyager 78-9945 Telescope

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