Question about Tasco 350x50mm Refractor Novice Telescopes

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I am a beginner, and I no longer have a manual. My telescope is a model type 78-4678, 900 mm focus length, 4.5 inch objective lens. I am unable to get any images with my telescope, regardless of which lens I use, and despite making my attempts in an area with little light interference. Basically, I am failing miserably at using this item, and would appreciate a step by step breakdown on precisely what to do.

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  • chaney1 Aug 30, 2008

    bought my tasco 420 second hand have no idea how it works, to me it looks out of allignment, if i take the lens out i see the edge of the mirror and the tube side and some light, i certinally get no image with the lens in, i have no instruction book and no idea what to do. please help


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This is a very simple refractor style telescope-- put the diagonal into the back of the telescope then put ONLY the eyepiece with the largest number written on it into the diagonal. Practice focusing during the day time -- on a distant object.

This is just like the scope Galileo used 400 years ago! Nothing to it-- but realize that it is ONLY 50mm in aperture the same size as a pair of 10x50mm binoculars.

Posted on Jul 09, 2011

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I need a Manual for National Geographic NG114AZ as well as replace the adjuster for the erecting eyepiece. where do I get these>

I think you are asking for a replacement focuser. You can probably find one here:

A manual is another question. These scopes are imported and no manuals are available. However the manual only has assembly instructions it does not tell you how to use the telescope to find objects in the night sky.

Find a local Astronomy Club and the members will help you set it up-- very easy once you see it done 1 time.

Clear skies.

Jul 08, 2015 | National Geographic Optics

1 Answer

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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I have a Barska telescope. Model: 60800. Diam: 60mm Focal length: 800 mm. I think I put it together correctly, but I can not see anything through it... just black. Yes, I have taken the cap off the...

The power of the scope will be the focal length of the main objective (yours is 800mm) 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.

Starting out, you want to use the lowest power, so the highest number, eyepiece. Do NOT use the Barlow lens if one came with the scope. Try it out during the day (but never point a telescope anywhere near the Sun). This will make it easier to find the focus point. There is a very wide range of movement in the focus mechanism, because different eyepieces focus at different points, but the actual focus range for any eyepiece will be a small part of the overall range afforded by the focusing mount.

It is unlikely that the finder scope will be much use in pointing the telescope until you adjust it to precisely line up with the main scope. Most manuals recommend that you do this in daylight, by pointing the scope at an object on the horizon and adjusting the finder to match. Once you have a tree or mountain peak in the center of the main scopes image, you can then adjust the screws around the finder scope to get the crosshairs centered on the same object. It is very difficult to do this job in the dark, especially as objects in the sky are constantly on the move.

Remember that 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.

Dec 31, 2010 | Optics

1 Answer

I just received as a gift, set it up and nowI am unable to see anything. the instruction manual is vague, only tells me how to set it up but not much else. thanks

The manuals DO NOT tell you how to find objects in the night sky, they are only assembly instructions. Wish you had not bought that telescope, this type would have been better for a beginner.

Take the scope outside during the day time and put the eyepiece with the largest number written on it into the focuser. Practice focusing on a distant object. The moon should be your first target at night.

Locate an Astronomy club nearby and the members will help you learn the sky. All sky objects are smaller than the tip of your finger held at arm's length. The scope must be pointed directly at them to see anything.

Read my tips on my profile page.

Dec 16, 2010 | Bushnell 3" Reflector Telescope w/Talking...

1 Answer

I need a manual for the deep space hunter 6 inch purchased around 2002. model number DSH-6

Why would you need a manual for a simple Dobsonian reflector telescope.

The Company does not exist-- anymore.

A manual only showed how to assemble the telescope, it DOES NOT tell you how to USE the telescope to find objects in the sky.

This is a good beginner telescope by the way. Here is how to get started using it:

1. During the day time align the small finder scope and the big scope on the same distant target. Then you can use the finder scope to locate and POINT the main tube to objects in the night sky.

Also during the day put the eyepiece with the largest number written on it into the focuser. This is your LOWEST magnification. Practice focusing on a distant object. The image will be upside down--- this is perfectly normal. Nothing is wrong with the scope.

The moon should be the first target at night.

Buy two books: Turn Left at Orion and Nightwatch.

Download the free monthly star charts at:

You can watch there videos to learn about Astronomy for beginners--

Aug 26, 2010 | Hardin Optical Deep Space Hunter 6 (240 x...

1 Answer

I unable to view from my Calileo F1100 x 102 mm Catadioptirc

Since you can focus on trees during the daytime nothing is wrong with the telescope-- most objects in the sky are very tiny-- you must be pointed directly at them to see them. During the day line up the small finder telescope on top with the main telescope-- then use the small finder to point the larger "tube" directly at the object in the sky.

Jun 10, 2009 | Galileo New Age 800x80 Telescope

1 Answer

Unable to see out telescope, might be missing a lens

You need a "diagonal" and an eyepiece on the "small end" of the telescope-- where the focus knobs are located.

Do you have these pieces? If you do put the eyepiece with the LARGEST number written on it into the diagonal and then put the diagonal into the telescope. The bigger the number the LESS magnification.

Go outside during the day and practice focusing on a distant object at least 100 yards away --- the lower magnification helps you learn how to focus.

Mar 13, 2009 | Bushnell Deep Space 78-9512 (120 x 60mm)...

1 Answer

Meade DS-2000 Manual Doesn't have info. about Meade Ds-2130

ds-2000 refers to the model line of the scope. ds-2130 the 130 refers to the diameter of the objective lens in mm. I have a ds-2114. Where the objective lens is 114 mm in diameter. as far as the manual goes everything else should be the same.

Dec 07, 2008 | Meade DS-2130ATS (250 x 127mm) Telescope

1 Answer

Lens SR6

That's because it is TOO MUCH magnification for that small aperture telescope. This is one of the most common problems for beginners. They believe that you need a lot of magnification to see objects in the night sky. In my 8 inch telescope I rarely go over 120 power -- magnification is the least important property of a telescope. Aperture and good optics are much more important.

Watch the video and audio podcasts on these web sites.

Aug 08, 2008 | C-Star Optics TT-150 Telescope

1 Answer

Lense, objective

Here's the link to the manual if you need it; call; 1-800-423-3537 and they will be able to tell you how to get a replacement OL Hope this helps :)

Sep 25, 2006 | Tasco Specialty 56TN (200 x 50mm)...

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