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

1 Answer

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

Posted by on

  • 1 more comment 
  • Anonymous Nov 11, 2007

    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

  • Anonymous Nov 11, 2007

    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

  • Nevgar Nov 25, 2007

    I think I may need to adjust the focus with the three or four screws at the back, but I don't want to do that without the okay from someone who knows what they are doing.

×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

Start by adjusting the focus draw tube all the way in, then back a little bit. In the day time indoors, remove the lens from the draw tube. Look into to the draw tube. You should be able to see your eye centered in the mirror. If you cannot see your eye at all, either the primary is tipped drastically or the secondary mirror is way out of adjustment. In that event I would return this scope to where you got it.

Posted on Nov 09, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a Bushnell Voyager telescope and can't see anything thru it at night!


Did you set it up according to the provided instructions?
Do you have a low power eyepiece inserted at the viewing end?
Have you aimed the telescope at the moon as a basic test of
visibility?
If your telescope is not properly aimed at the target (a star or a planet, or other object in the night sky) then you will see nothing.
If the power of your eyepiece is too large and your telescope aim is
not "dead on", then you will see nothing.
Have you tried using the scope in the daytime? Do you see anything?
Aim at a specific object, or section of an object, like the top of a lamp-post about a block or two away, and see if you can focus on
it the eyepiece.
You really need someone at your side who has experience in using
astronomical telescopes. That would be the quickest way to solve
any problems you have.
Unless your question is very specific, and unless you provide as
much detail as possible about your problem, it will be difficult for
anyone to provide you with speecific answers that will help you
solve your problem.
joy,
walt

May 06, 2014 | Bushnell 789961 Voyager Sky Tour 700mm X...

5 Answers

Cannot see anything.


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

Jan 09, 2008 | Bushnell NorthStar 78-8831 (525 x 76mm)...

1 Answer

When I use a Barlow lens do I insert it before focusing on an object through the eyepiece or do I insert the lens after I've focused on an object (eg: Jupiter)


You will have to refocus after inserting the barlow. The barlow will change the focal point of the eyepiece

Apr 06, 2013 | Optics

1 Answer

I was given a barska 40070 i was assembling it then i came across the barlow lens i tried putting it on my telescope i did but then i went outside i had aligned everything prior to it I looke into the...


A barlow doubles the magnification of the eyepiece and halves the field of view so it it very hard to center an object. Use the lowest power eyepiece (highest number) first. Center the object in the eyepiece, then you can insert the barlow between the scope and the eyepiece. You will be surprised how far off from center you are.

Dec 27, 2012 | Barska 40070 Starwatcher Compact Refractor...

1 Answer

What is the different parts on a microscopes


Therre are the three sections normally , the first the eyepiece which the one to set the focus according to the lens choice .The seccond is the main tube containing the set of lens for magnification and the third consistts of normally three settings of lens with different focal lengths. You can use the coarse settings , the the fine and the micro, use the eye piece to set.

Sep 01, 2010 | C And A Scientific My First Lab Digital...

1 Answer

The diopter setting eyepiece has come out of the body of my Bushnell 10X42 ''Waterproof'' binoculars, model 13-2410. I see keyways inside, but cannot screw it back in more than about 1/4 turn, which is...


The entire diopter setting eyepiece was off.I separated the eye cup from the rest of the diopter setting eyepiece, and aligned the channel guides on the lens piece to slide it into place. Then holding it in place, taking care not to gum up the lens, I experimented with how to screw in the retainer ring so that its white dot registered correctly. Finally reattach the eye cup and focus. It's like new!

Apr 10, 2010 | Bushnell Waterproof Binoculars

1 Answer

I dont know how to use my barlow lens


I use a barlow lens quite a bit with my telescope. It is usually inserted before the diagonal if you use one or before the eyepiece if you don't. The barlow lens for your telescope will double the power of the eyepiece used.

However, despite what the manufacturer claims for your telescope things will look quite poorly if you try to view at 180 power. Generally you'll get the best images by using 50x for each inch of your objective lens. For example, your telescope has a 50mm lens. That's roughly 2 inches. 2 inches times 50x gives you a maximum useful power of 100x. Depending on the viewing conditions you may be able to exceed this or not even reach it. Things will look blurry and dim when you try to use too much power.

Your power or magnification is calculated by dividing your telescope focal length which is 360 mm by the eyepiece focal length. You have two eyepieces with focal lengths of 4mm and 20mm. If we divide 360mm by 20mm we get 18 power. If you add a barlow to that you get 36 power. Dividing 360mm by 4mm (no barlow) we get 90 power. That would be your maximum useful power.

Therefore, you should be able to used the 20mm eyepiece with or without the barlow but the 4mm should only be used without the barlow.

I hope all of the math wasn't confusing.

-jodair

Feb 12, 2009 | Edu-Science (10166) Telescope

1 Answer

Bushnell 700x76


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

Jan 29, 2008 | Bushnell 3" Reflector Telescope w/Talking...

1 Answer

What lens do i insert into scope to view the moon


The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky.
So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.

Dec 30, 2007 | Tasco 350x50mm Refractor Novice Telescopes

3 Answers

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.

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!

Dec 26, 2007 | Bushnell NorthStar 78-8831 (525 x 76mm)...

Not finding what you are looking for?
Bushnell NorthStar 78-8831 (525 x 76mm) Telescope Logo

236 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bushnell Optics Experts

Joe Lalumia aka...
Joe Lalumia aka...

Level 3 Expert

3186 Answers

yadayada
yadayada

Level 3 Expert

78936 Answers

Brad Brown

Level 3 Expert

17093 Answers

Are you a Bushnell Optic Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...