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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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!

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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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