Question about Bushnell Voyager 78-9440 (440 x 12.5mm) Telescope

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Eyepieces not fitting into 90-degree penta mirror

My 2 included eyepieces will not fit into the 90-degree penta-mirror. Am I missing a part that fits between the mirror and the eyepieces or should I get a file to make them fit (kidding). Thanks for any ideas. PB

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Here's the link to the user manual if you need it; http://www.bushnell.com/customer_service/manuals/telescopes/78-9440_Voyager.pdf Check the bottom of page 3, I think it answers your question - eyepieces should insert directly into the penta mirror. check page 9 for a diagram showing the whole assembly. If it turns out you have the wrong eyepieces, you can contact bushnell's spares department on; http://www.bushnell.com/customer_service/partsinfo.cfm?section=General%20Use Hope this helps, please ask again if you need more info :)

Posted on Sep 16, 2007

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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".

If the telescope has a standard 1.25 inch diameter eyepiece, then an erecting eyepiece may be found on Amazon or eBay. An erecting prism or diagonal of the type that bends the light through 90 degrees is not right for a reflecting scope. These are used on refractors.

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Assuming this is the usual size (1.25 inch barrel), you can find these and other eyepieces and accessories on eBay and Amazon. You won't find the telescience brand name, but that doesn't matter.

You don't actually need this to use the telescope. The eyepieces will fit directly in the focussing mount.

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I need the eyepiece for the vivitar refractor telescope ot accidently was broking when I shipped to the Bahamas


You don't say whether this is an astronomical telescope or a terrestrial one (spotting scope). However, I have a Vivitar scope which was sold as an astronomical scope, but is actually a spotting scope, although it uses astronomical style eyepieces, so...

I am not sure that it is the eyepiece you want, either. It is hard to break an eyepiece, but much easier to break the eyepiece mount or diagonal mirror fitting.

Most astronomical telescopes use a standard fitting eyepiece with a 1.25 inch outside diameter barrel. You can measure the mount where the eyepiece goes to make sure that yours is this size, then search on eBay or Amazon for "1.25 eyepiece" and you will find many available. It doesn't have to be made by Vivitar, any make will fit.

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1 Answer

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What Tasco do you own is it a refractor or reflector? Does it have a lens in front -- then it's a refractor; or mirrors, then it's a reflector.

On a refractor the eyepieces go in the back of the tube, sometimes you also have a diagonal which goes into the scope first and then the eyepiece goes into the diagonal. The diagonal is simply an L shaped device with a mirror inside that makes it easier to look through the scope when it is pointed UP at an angle.

On a reflector the focuser is on the FRONT side of the tube, and the eyepiece goes into the focuser.

Take the scope outside during the day time and practice focusing on a distant object. Put the eyepiece with the largest number written on it into the focuser or into the diagonal. This is your LOWEST magnification.

Practice focusing --- until you get used to how it is done. Turn the focuser knob to the left slowly-- if nothing comes to focus then try turning it to the right. It may take several full turns to come to focus.

At night the moon should be your first target.

Read my TIPS on my profile page.

ABOUT NOT FITTING: eyepieces come in 3 sizes, .975, 1.25, and 2 inch sizes. Measure the hole and then measure the eyepiece-- it may be that you have the wrong size eyepieces for that scope. The correct size can be purchased on line from many retailers. Here is one telescope retailer that sells eyepieces and other accessories:

http://www.agenaastro.com/

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You are missing the 2 inch to 1.25 inch adapter, that fits into the focuser so you can use 1.25 inch eyepieces.

Here:

http://www.agenaastro.com/Blue-Fireball-2-to-1-25-Eyepiece-Adapter-p/paar-bf-e04017.htm

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Normally only about 30-40 times aperture is possible. So about 90 power is your normal max magnification.

We see this every Christmas. People buy scopes that say 275 power or 500 power on the outside of the box. It's a LIE!

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1 Answer

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first, use the lowest power eyepiece, that's the one with the high number on it with 'mm' after the number.

for a refractor telescope (uses lenses), you might have to add a diagnal lens (either 45 degree or 90 degree, whichever one you have) to focus on an object.
attach it in this order:

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