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

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What is the lens arrangment in the eyepiece of an 18-1560?

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Did you DIS-assemble the eyepiece? If you did no one can tell you how to put it back together.There are so many different eyepieces. Normally the eyepieces just slip into the focuser.

Posted on Jun 06, 2010

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1 Answer

How do I properly arrange the objective lenses in the Meade 285?


The OBJECTIVE lens is the one in the front of the scope-- you DID NOT take it apart did you?

You only needed to clean `the outside of the glass elements. Read my tips on my profile page about why you never disassemble these and or eyepieces completely.

Mar 24, 2011 | Meade Polaris 285 (225 x 60mm) Telescope

1 Answer

I need a new lens


Do you mean a FRONT lens or an eyepiece?

You cannot get a replacement front lens.

Eyepieces are sold by many retailers and come in 3 sizes: .965, 1.25, and 2 inch sizes.

Here is one retailer:

http://www.agenaastro.com/

Nov 25, 2010 | Edu-Science (10166) Telescope

1 Answer

Completed setup, can't see anything through eyepiece.


I answered your question already-- TURN THE SCOPE around you have it mounted backwards! The eyepiece end is pointed UP. Like the picture above in your question.

Jan 22, 2010 | Bushnell Deep Space 78-9003 (525 x 76mm)...

1 Answer

My edu science telescope got only one lens where can i buy edu science telescope lens in the philippines, any outlet in manila


You can buy eyepieces at many on-line retailers. Measure the hole. Eyepieces come in 3 sizes; .965, 1.25, and 2 inch sizes.

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

http://www.optcorp.com/category.aspx?uid=30-718

Nov 19, 2009 | Optics

2 Answers

I just bought one at a garage sale and donn't know where to look thru


You never said the make or model or type of telescope???

Refractors have a lens in front and the eyepiece goes in the back end of the tube.

A reflector has a mirror and the eyepiece usually goes in NEAR the front end of the tube.

Oct 16, 2009 | Tasco Luminova 40060660 (660 x 60mm)...

3 Answers

Lost lens to bushnell 18-1561


I have a similar problem with my Bushnell 18-1650!

As you can see below, the plastic thing that holds the lens snapped off from the telescope's diagonal, and is now lost along with the eyepieces. This is a childhood scope I'm trying to rescue!

Should I:
1) glue a new eyepiece straight onto the diagonal
2) buy a new diagonal AND eyepiece
Or do I need to just buy a new telescope?

Thanks in advance.

annahetherin.jpg

Sep 04, 2009 | Bushnell Deep Space 18-1560 (150 x 53mm)...

1 Answer

No lens


I am assuming by "lens" you mean eyepieces.

You don't need to get Vivitar brand eyepieces to get additional ones for your telescope. I'm not sure of the specifications for this particular telescope but in general they come in two barrel sizes for the eyepieces. The diameter of your eyepiece is probably 0.965" but could come in the more standard 1.25". You can measure the diameter and determine this quickly.

Once you know the diameter to shop for you can look for the focal length of the eyepiece you wish to purchase. They are rated such as 4mm, 10mm, 25mm, etc. The smaller numbers give you higher magnification. You can calculate the magnification by dividing the telescopes focal length by the eyepiece focal length. For example, let's say your telescope is has a focal length of 360mm and you have an eyepiece rated 10mm. Divide 360 by 10 and that gives you a magnification power of 36.

You can find eyepieces at many telescope dealers on the internet. Your selection will be far less if you use 0.965" eyepieces. You can purchase 0.965" to 1.25" adapters so that you can use the larger eyepieces with your telescope. However, on some telescopes the adapters will cause the new eyepiece to not come into focus.

You'll also find that eyepiece prices go all over the place. A good general purpose eyepiece is a type called the Plossl. The better eyepieces have more coatings too that allow more light to get through to your eye. You'll find these listed with terms like "fully multi-coated".

I hope this helps.

Good luck and clear skies!

-jodair


Mar 05, 2009 | Vivitar (1607225) Telescope

2 Answers

Need lens for vivitar telescope


You sure it did not have one or two eyepieces???

Anyway-- eyepieces come in 3 sizes--- .965, 1.25, and 2 inch sizes--- your's is either a .965 or a 1.25 measure the hole---

You can buy eyepieces at these web sites--

http://www.telescope.com/control/category/~category_id=eyepieces/~pcategory=accessories

http://www.agenaastro.com/


Jan 04, 2009 | Vivitar (1607225) Telescope

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

Bushnell 18-1560 Telescope


Hello,
What you have is called a refractor-type telescope with the primary lenses (the Objective) at the top of the tube and the only other lenses in the system are your selection of eyepieces, probably a barlow lens (2X magnification of any eyepiece used), and a diagonal (in line mirror so that you cand see into the telescope from the side.). As the focal lenth of the eyepiece decreases, so does the distance away from the Objective Lens. I believe that you are using the telescope with a diagonal mirror which makes the optical path longer. The fact that your longer focal lenght eyepiece can focus and not your short one would be only if you didn't have the diagonal or the eyepiece all the way in tight to allow the focus mechanism (rack and pinioin) to get compressed enough to focus. Look at the Moon, if the image gets smaller then bigger as you focus, but not sharp, then I would have to tell you that your eyepeice lenses are not in the right order. Someoner may have taken it apart and didn.t put them back in the correct order. The lenese could just be very dirty also. Barrow a short focal lenght eyepice from a friend and see if it works in your system. Then you will know for sure.

May 15, 2007 | Bushnell Deep Space 18-1560 (150 x 53mm)...

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