Question about Bushnell NorthStar 78-8831 (525 x 76mm) Telescope

5 Answers

Cannot see anything.

Just got a 78-8831 and set it up according to instructions.  After inserting lens into eyepiece, I can't see anything at all.  Dont worry, I've removed the front cap from the the main telescope.

Something leads to believe I'm either missing something real fundamental or my telescope is broken.  Please help

I cannot see anything either. I've spoken with several people where it was bought and they assure me that everything is set up corretly. I cannot find and telephone number to call someone for assistance.

Posted by on

  • rnska2 Feb 16, 2008

    I can now see things through it but they are upside down. What can I do to fix this

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5 Answers

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In addition.... you can download the complete manual immediately here :

http://www.astronomics.com/main/documents/bushnell/78-8890_northstar.pdf

cheers

Posted on Feb 16, 2008

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  • Master
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Hello sir

Posted on Feb 16, 2008

  • 1 more comment 
  • isaac johny
    isaac johny Feb 16, 2008

    If you dont have any experience with telescopes, I suggest trying it
    first in daytime, since daytime objects are much better for getting
    experience. Also, start with the lowest power eyepiece,
    the one with the largest lens. Start by looking towards something
    pretty big, like a car or a house, and it needs to be some distance
    away to even have a chance to get a focus. If your target is closer
    than about 1/4 mile, you should add the right angle eyepiece attachment
    to allow you to focus in on closer objects.

    When you are finally
    set up with the low power eyepiece, and have a good big target in the
    daytime, start looking thru the telescope while turning the knob thru
    the entire range. At some point of knob turning, you should see some
    image appear in the eyepiece..Turn the knob slowly to focus it clearly.

    And
    this is for the shaky tripod. If you can hang a book under the middle
    of the tripod, the added weight will help stabilize the telescope, and
    you should be able to see a little better, without so much motion at
    the slightest touch.

    After you look at the first car or house,
    you can see how careful you have to be to use the telescope,
    and you can start to look at other objects. When you move to the higher
    power eyepieces, it will be even more critical in getting it both
    aimed and focused. If its off by just a few degrees, you wont see what
    you are looking for.

    When you start nightime viewing, start with
    the largest object in the sky, the moon. Its the same process as
    daytime, except the eyepiece mechanism will have to be adjusted a
    little closer to the main body of the telescope.

    Viewing planets
    and stars will be the ultimate test. Stars and planets are harder to
    see, since they are small, and hard to see unless they are in focus.
    When you can see those views, you have passed the telescope test. Its a
    matter of careful aim, and having the telescope focus set close to the
    point where you can see objects that are VERY FAR AWAY. If you are able
    to focus on the moon, you will be fairly close to being able to focus
    on the planets. The hardest part is actually getting the planet in the
    view of the telescope, in other words, aiming it.

    The last item
    that can really mess up the view is a fogged up lens. Usually this
    happens in the summer when the scope has been in the air-conditioned
    room, and then it fogs up when taken outside. The solution for this is
    to let the telescope sit outside for 20 minutes, so the fogged lenses
    can clear. By the way, the same fogging may happen when you bring the
    telescope inside during the winter.

    I hope this helps you
    eventually get a clear view of some amazing views in the sky. Your
    final exam is to take a look at the moon, the rings of Saturn, and the
    moons of Jupiter, some time in the near future. Have Fun!

  • isaac johny
    isaac johny Feb 16, 2008

    this is taken from fixya site only...if it was helpful plz reply

  • isaac johny
    isaac johny Feb 16, 2008

    As we all learned in grade school, telescopes produce an upside down
    image - it's okay for astronomical use since upside down doesn't
    matter. If you want an image like you'd see in a pair of binoculars,
    get an image erector from a telescope accessory store to add to your
    eyepiece.

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  • 347 Answers

Hi Rnska
If you dont have the manual and you wish to take a look at it, you can get it here. You will have to register (at the right) you can fill it with fake info if you want, then you will be able to download it.

Posted on Jan 09, 2008

  • Santiago Vallejo
    Santiago Vallejo Jan 09, 2008

    you can also try it in day time. Aim at anything during the day and if you see a blurry image, but not just black, that means you were not aiming at nothing last time you tried it, or maybe there were many clouds in the sky.

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  • Expert
  • 152 Answers

Do you at least can see some light trough the part where you put the eye? if you cant see a light, then setup is wrong and there is something blocking your view...
otherwise.. it needs to be refocused... maybe you arent pointing it to your target correctly...

try pointing it to the moon (since its big and hard to miss) then, if you get some light (no matter if its blurry or not) start focusing and maybe cleaning the lens...

good luck with that.. hope that helps

Posted on Jan 09, 2008

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  • Master
  • 1,894 Answers

Do you see only black image when you look trough it?

Posted on Jan 09, 2008

  • dewan nafees ahmed Jan 09, 2008


    This would be difficult to answer without being there to check it out
    myself. however be aware that if it is a reflector scope the angled
    mirror on the inside may have a protective cover over it, or it may be
    angled wrong, if you had to assemble consult the directions again. Also
    the finder scope may not be in line with the main . try removing the
    view lens and moving in little circles tword the moon you may notice
    lite on the inner wall of the scope. if its a refracter the its
    defiantly miss alignment between finder and main try a day lite target
    and the adjust the finder and main in both instances before it gets
    dark, hope that helps . Also you could try finding a lit in your
    neigbor hood like a street lamp and with the lowest mag lens try to
    align your finder too the main

  • dewan nafees ahmed Jan 09, 2008

    You say the lens cover is off, but is it _completely_ off? Many
    telescopes come with a two-part lens cover. If you've only removed the
    middle part, the light will be blocked from reaching the primary mirror
    by the secondary mirror. When the lens cover is completely removed, the
    hole in the end of the tube should be as large as the tube itself.



    Another possibility is that the secondary mirror is rotated out of
    position. If you look in the focuser without an eyepiece in place, you
    should see the secondary mirror. On that you should see a reflection of
    the primary mirror, and in the centre of that, a reflection of the
    secondary mirror, and within that a reflection of your eye. All should
    be concentric. If not, first adjust the secondary mirror, so that the
    reflection of the primary mirror is centred in it, then adjust the
    primary mirror so that the secondary is centred in it. This is called
    collimation. Check the source for more details and illustrations.

    source is from yahoo answers.

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78-8831


If you dont have any experience with telescopes, I suggest trying it first in daytime, since daytime objects are much better for getting experience. Also, start with the lowest power eyepiece, the one with the largest lens. Start by looking towards something pretty big, like a car or a house, and it needs to be some distance away to even have a chance to get a focus. If your target is closer than about 1/4 mile, you should add the right angle eyepiece attachment to allow you to focus in on closer objects.

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And this is for the shaky tripod. If you can hang a book under the middle of the tripod, the added weight will help stabilize the telescope, and you should be able to see a little better, without so much motion at the slightest touch.

After you look at the first car or house, you can see how careful you have to be to use the telescope, and you can start to look at other objects. When you move to the higher power eyepieces, it will be even more critical in getting it both aimed and focused. If its off by just a few degrees, you wont see what you are looking for.

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