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Hi, I'm a novice with a Tasco 303911 telescope i was given and have been told to get a barlow lens to increase magnification but don't know what size to order. Unfortunately when i got the scope it came without specific instructions or specs. I've visited the Tasco site but there's nothing there to help me. Can you help?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: what lens do i insert into scope to view the moon

The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky.
So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.

Posted on Jan 02, 2008

  • 21 Answers

SOURCE: TASCO TELESCOPE NOVICE 402X POWER REFRACTOR

What eyepiece do you have in the scope when trying to view the sky? (in mm)
I recommend starting out looking at the moon with the largest eyepiece you have (25mm, 20mm etc.). It is an easy target and is very impressive. Stars tend to look pretty much like little points of light in a refractor such as this anyway. Pretty boring.
Try Jupiter after you've got the moon down. You can work your way to Saturn's rings after that.

Posted on Aug 11, 2008

SOURCE: i have an old Tasco Telescope #271808 with a

This is a small refractor style telescope--- most iof them assemble exactly alike. Look through the Meade manual page for one that is similar to yours and download it for free.

http://www.meade.com/manuals/index.html

Yours is similar to this one--
http://www.meade.com/manuals/TelescopeManuals/Refractors/Meade70AZ_AR.pdf

Posted on Jun 18, 2009

SOURCE: Need setup document for 8" Tasco 38T reflecting telescope

Full instructions! Scope is basically the same as here:

http://picasaweb.google.com/Ben.Bartine/Meade826

Have fun and start out with your lowest power (biggest number) eyepiece and without the barlow. The moon is a nice place to start (and keep coming back to...;-)

Posted on Aug 14, 2008

SOURCE: missing finder scope

This will do just fine--

http://www.telescope.com/control/product/~category_id=finder_scopes/~pcategory=accessories/~product_id=07228

Posted on Dec 27, 2008

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About my tasco 46-060675 D=60mm F=900mm come with 3 eye lense 1(sr4mm) 2 (k10MM) 3(k25MM) and two tube 1(1.5x erecting eyepiece) 2 (3xbarlow lense


The different eyepieces are to give different magnifications. This is worked out by dividing the focal length of the telescope, f = 900, by that of the EP. So the 25 mm Kellner (that is the type of optics in the EP) will give 900 / 25 = 36 times magnification.

The erecting eyepiece is used for terrestrial viewing. Normally with an astro telescope everything is upside down as that does not matter when looking at a star. So when you want to look through someone's bedroom window you use this.

A Barlow lens is an add-on magnifier. If you add this onto any EP (it normally fits between the EP and the scope) it will increase magnification x 3.

There is a practical limit to what any scope will deliver, governed by its aperture (the size of the front lens) and for your scope this will be about x 120 magnification. Beyond that the image becomes too dim and fuzzy. This means that your 4 mm eyepiece ( x 225 magnification) won't be much use. It will be hard to find the object you are trying to observe, it will be hard to focus, and the image will wobble around. Nor is your barlow lens much use either I fear.

You might consider another eyepiece around 18 mm to give a nice spread. A Plossl type is good. If you get serious about astronomy, I think you will immediately want a better scope after using the Tasco.

Mar 23, 2015 | Tasco Optics

1 Answer

Cannot get it focused


Use only the eyepiece with the largest numbver written on it-- do NOT use the 2x barlow it applys TOO MUCH magnification. Try again.

Aug 27, 2011 | Tasco Novice 30060402 (402 x 60mm)...

1 Answer

Ido not know how to assemble it. The instructions are generic for all their telescopes. Where do I out the different lens that came with it? How do I install them? Help please.


The lower the number on the eyepieces the HIGHER the magnification. The 2x barlow DOUBLES the magnification of each of the eyepieces. To start just put the eyepiece with the largest number written on it into the focuser, and use that ONLY until you learn how to focus properly.

The eyepieces fit right into the hole in the focuser.


www.telescopeman.org
www.telescopeman.us
www.telescopeman.info

Aug 23, 2011 | Tasco Luminova 40114675 (675 x 114mm)...

1 Answer

What do you use the barlow lesns for?


The Barlow lens goes between the diagonal and an eyepiece. It doubles (2x) the magnification of the eyepiece used.It does this by halving the f/ ratio of the scope.
Eyepiece alone gives 35x; barlow with eyepiece =70x.

Note: this scope comes with an erecting eyepiece and is NOT suitable for atronomy use (other than perhaps the moon)

Mar 19, 2011 | Tasco Specialty 301051N (100 x 50mm)...

1 Answer

Vivitar 76mm reflector teles.76700 barlow lens 3x eyepiece is to small for it.is there a reducer for the barlow ?kit came with two 3x barlow.same size


No the barlow increases the magnification by 3 TIMES for any eyepiece --
this will be too much for that small 76mm telescope.

Magnification is the least important quality of a telescope. Aperture and quality ioptics are much more important. I usually never use a barlow -- just the straight eyepieces in various mm sizes.

Read my tips on my profile page.

Feb 03, 2011 | Vivitar (1607225) Telescope

1 Answer

Every thing looks blurry. what conbination eyepiece, diagonal, or barlow should be used to see the moon clearly?


I would start out with the minimum power eyepiece (the one with the largest number) and no barlow lens (throw it away). You might try without the diagonal just in case it is the problem, but it is unlikely to be causing this. If you can't get a reasonable image at low power, then the scope may be faulty or damaged.

A small telescope is not capable of much magnification, despite what it says on the box. You get dim blurry blobs if you try to go much over 50x or so, maybe less with this scope. Tasco scopes are not noted for their optical quality, and the eyepieces are often poor.

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

Jan 22, 2011 | Tasco 350x50mm Refractor Novice Telescopes

1 Answer

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)...

1 Answer

Wont focus correctly


TOO MUCH magnification. Put the eyepiece with the largest number written on it into the telescope. DO NOT USE the 2x barlow. Try Jupiter with lower magnification.

Oct 05, 2009 | Optics

1 Answer

I have an old Tasco Telescope #271808 with a Barlow Lens 2x magnification D=76.2mm f-1200mm and are looking for instructions on how to work it. If anyone could help that would be wonderful.


This is a small refractor style telescope--- most iof them assemble exactly alike. Look through the Meade manual page for one that is similar to yours and download it for free.

http://www.meade.com/manuals/index.html

Yours is similar to this one--
http://www.meade.com/manuals/TelescopeManuals/Refractors/Meade70AZ_AR.pdf

Jun 15, 2009 | Tasco Optics

1 Answer

What lens do i insert into scope to view the moon


The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky.
So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.

Dec 30, 2007 | Tasco 350x50mm Refractor Novice Telescopes

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