Question about Bushnell Deep Space 18-1560 (150 x 53mm) Telescope

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Hi, the plastic bit snapped off the telescope's diagonal (where you fix the eyepiece), and this, plus the eyepiece is nowhere to be found. It was a childhood telescope I am trying to rescue! (a Bushnell Explorer 18-1560) Should I: 1) try and glue a new eyepiece to the place the holder snapped off, 2) buy a new diagonal AND eyepiece or do I need to buy a new telescope altogether?! Thanks in advance.

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You can certainly buy both eyepiece(s) and a diagonal, but you may find the price rather high compared with the value of the telescope. You probably don't actually need the diagonal- if you remove the broken one you should find that it is possible to insert an eyepiece directly in the hole it comes out of. The diagonal is useful for two things, it partially erects the image (astronomical telescopes usually display the image inverted), and it provides a more convenient viewing angle.

I am assuming the the eyepiece size is 1.25 inch outside diameter- the standard for small telescopes. Some earlier scopes might require an eyepiece just under an inch in diameter. These will be much harder to find now.

There is a useful website about small scopes on THIS LINK

Posted on Jan 03, 2011

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1 Answer

Need eye peice


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Can you focus on a distant object during the day time? Do you still have the "diagonal" if this is a refractor style telescope? This is a diagonal it goes into the focuser and then the eyepieces go into the diagonal. Put the eyepiece with the largest number written on it into the diagonal and practice focusing during the day time. DO NOT USE the 2x barlow if you have one.

http://www.amazon.com/b?ie=UTF8&node=3426071 These are diagonals.

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Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear.

It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but if you want a telescope primarily for terrestrial use, you are much better off buying what is called a "spotting scope".

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You never told us what model number or telescope TYPE you own. Is this a refractor or a reflector. ???

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The eyepiece slips into the hole in the focuser. You might also have a diagonal. Put the diagonal into the focuser first and then put the eyepiece into the diagonal.

You will find it is almost impossible to buy the .975 inch eyepieces that go into this telescope. The cost may be about the same amount as you spent on that scope. This is one of the worst telescopes to buy. We get many complaints on that brand which is being sold by Toys R Us.

It is almost useless for the astronomy hobby.

Read my tips on my profile page.

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Look at the picture on this web site:
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3 Answers

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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)...

3 Answers

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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.

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