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I just assembled my telescope that I received in 2001 it is a Voyager with 750 focal lens. I tried to sdjust the scope outside and I can not see anything thru the lens. I used a 15mm lens to view thru with a Penta mirror. What can I do or correct?

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Practice focusing during the day on a distant object at least 100 yards away-- use the eyepiece with the LARGEST number written on it-- and DO NOT use any 2x or 3x barlow to multiple the power.

The moon should be your first target at night.

Posted on Jun 28, 2009

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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.

The other variable will be the focal length of the eyepiece, which is what determines it's power. The power of the scope will be the focal length of the main objective divided by the focal length of the eyepiece, so a 9mm eyepiece will give a higher magnification (and be dimmer and harder to focus and find objects) than a 20mm eyepiece. It is usual to have two or three different focal length eyepieces for viewing different objects.

Jan 23, 2011 | Vivitar (1607225) Telescope

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The eye piece lens is missing. How do i find the model number of the telescope to order a new eye piece and a manul for this telescope


Most 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. None of these will be made by "Edu-Science", but any make will fit.

The other variable will be the focal length of the eyepiece, which is what determines it's power. The power of the scope will be the focal length of the main objective divided by the focal length of the eyepiece, so a 9mm eyepiece will give a higher magnification (and be dimmer and harder to focus and find objects) than a 20mm eyepiece. It is usual to have two or three different focal length eyepieces for viewing different objects.

You will find a large variation in prices, which is partly due to the difference in quality and type of construction of the eyepieces. Kellner eyepieces are simple and cheap, whereas Possl or orthoscopic ones are more complex and cost more. There are reasons why people will pay more for the better eyepieces. Avoid eyepieces marked with the letters "H" or "SR" before the focal length.

There is an excellent website for beginner telescope users at THIS LINK

Jan 20, 2011 | Edu-Science (10166) Telescope

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One answer advises NOT to use the "barlow." A


A Barlow lens doubles (or trebles) the magnification, but it also degrades the image. You are better off without it. People tend to buy telescopes on their magnification figures, even though these are essentially meaningless, so junk like Barlows get added to the package to increase the advertising impact. The mere fact that one came with this telescope tells you that the quality is not wonderful.

The specification that means something in a scope is the diameter of the objective (the main lens or mirror). Magnification is just the focal length of the objective divided by the focal length of the eyepiece. You can usually see more at lower magnifications, as the resolving power of the objective is often less than the advertised magnification. A smaller distinct image is better than a big blob of fuzz. That's why you were advised to try the scope first with the larger number (lesser magnification) eyepiece.

But try out the Barlow and see for yourself.

Nov 19, 2010 | Bushnell Voyager 78-9470 (470 x 60mm)...

2 Answers

Just recieved from father christmas and cant focus into anything


This is a small 70mm refractor style telescope.

Put the eyepiece with the largest number written on it into the telescope. DO NOT USE the 2x barlow if you have one. This will double the power of the eyepiece. Your scope is too small to use the 2x barlow.

Now go outside during the day time and practice focusing on a distant object.

This may also help you:
http://www.texasastro.org/telescope.php

Dec 27, 2009 | National Geographic NG70CA (225 x 70mm)...

2 Answers

My scope will not focus it seems like the focal length was somehow knocked out


Yes it will focus. Put the eyepiece with the largest number written on it into the telescope. DO NOT use the 2x barlow. Go outside during the daytime and practice focusing on a distant object.

PS- focal length refers to the distance between the front lens of the telescope and the eyepiece. Are you saying the focuser itself BROKE? If it is missing the scope is not worth fixing, as a new focuser will cost you about as much as what you paid for the scope.

Aug 30, 2009 | Meade Optics

1 Answer

Can not see thru telescope.


Yes it will focus --- put the eyepiece with the LARGEST number written on it into the scope. DO NOT use the 2x or 3x barlow.

Practice focusing on a distant object at least 100 yards away during the day. The moon should be your first night time target.

Jun 26, 2009 | Bushnell Voyager 78-9470 (470 x 60mm)...

1 Answer

Never used received in 10/2002 as a gift. It has


I answered in a previous post--- you posted this twice.

Jun 26, 2009 | Bushnell Voyager 78-9470 (470 x 60mm)...

1 Answer

Telescope is only good for viewing moon...help!!!


your scope is 565mm focal length with a 60mm objective which makes it f:9.5. (telescope focal length divided by lens diameter)
all this means that the optics are capable of viewing larger planets. nebula is a bit of a stretch. maybe under exceptionally dark skies with at least 30min. of dark adaptation. brighter objects like m42 or m31 should be visible, bear in mind that only very large telescopes will resolve the slightest hint of color in nebulosity. the rest of us are reserved to gray scale. i would suggest using a 26mm eyepiece plossl if available. next make sure your finding system is aligned to the scope. this is best done during the day at a distant object like a radio tower. center the object in the eyepiece then align the finder.
next get your self a good sky map like stellarium software a freebie and a fav. to ensure your looking at what you think your looking at.

a word on eyepiece selection. magnification is calculated by dividing the focal length of the scope by the focal length of the eyepiece. for instance the scope is 565mm the recommended eyepiece is 26mm so the magnification would be around 22x.
a rule of thumb for optics is about 50x per inch of objective. which means your scope is good for about 100x. so by the math you would use a 5.6mm e.p. to achieve 100x, however as optical powers increase field of view decreases making it difficult to find objects. find your object with a wide field e.p. then switch to a higher power to zoom in. if the image gets fuzzy at high power attempt to refocus, if it doesn't clean up either your asking a bit to much from the scope or seeing conditions in the upper atmosphere may not be ideal. what ever you do don't give up there are some amazing things to see out there.

Nov 23, 2008 | Bushnell Voyager 78-9565 (120 x 60mm)...

1 Answer

Vivitar Telescope


Eypieces in telescopes usually come in two sizes .9" and 1.25" diameter. There are hundreds of scientific companies or telescope companies that can supply you with an inexpensive replacement. The eyepiece focal lengths, usually in millimeters, determines the magnification of the telescope. The focal length of the main lens divided by the focal length of the eyepiece is the magnification of the telescope. Usually two eyepieces are enough for your scope. Good luck

May 11, 2008 | Vivitar (1607225) Telescope

1 Answer

Lesser viewing area in my telescope


All telescopes have small fields of view-- even what is called a "rich field scope" has only about 2 degrees of view. Most scopes only have about 1 degree of view.

The key component is a short tube and a fast mirror of F4.5 or faster.

Dec 18, 2007 | Optics

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