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I dont know how to use my barlow lens

The guy in the video says that i dont need the barlow lens and keep practice on my telescope but i want to increase my view by using them

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I use a barlow lens quite a bit with my telescope. It is usually inserted before the diagonal if you use one or before the eyepiece if you don't. The barlow lens for your telescope will double the power of the eyepiece used.

However, despite what the manufacturer claims for your telescope things will look quite poorly if you try to view at 180 power. Generally you'll get the best images by using 50x for each inch of your objective lens. For example, your telescope has a 50mm lens. That's roughly 2 inches. 2 inches times 50x gives you a maximum useful power of 100x. Depending on the viewing conditions you may be able to exceed this or not even reach it. Things will look blurry and dim when you try to use too much power.

Your power or magnification is calculated by dividing your telescope focal length which is 360 mm by the eyepiece focal length. You have two eyepieces with focal lengths of 4mm and 20mm. If we divide 360mm by 20mm we get 18 power. If you add a barlow to that you get 36 power. Dividing 360mm by 4mm (no barlow) we get 90 power. That would be your maximum useful power.

Therefore, you should be able to used the 20mm eyepiece with or without the barlow but the 4mm should only be used without the barlow.

I hope all of the math wasn't confusing.

-jodair

Posted on Mar 25, 2009

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We cant see anything dont know if we r looking in the right place or not nothing is showing upside down i thought it was supposed to . we bought this at toys r us as they were moving,so we cant take it...


We receive more complaints on that brand than just about any other. There are two types of scopes.

A refractor with a lens in front and a focuser on the back--- and a reflector that uses mirrors.

For a refractor-- insert the diagonal onto the rear of the scope and then put the eyepiece into the diagonal-- DO NOT USE the 2x barlow. Take it out in the day time and practice focusing on a distant object.

If it is a reflector-- just put the same eyepiece into the focuser -- do not use the 2x barlow if you have one. Again take it outside during the day time and practice.

Read this:
http://texasastro.org/telescope.php



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

Aug 11, 2011 | Edu-Science (10166) Telescope

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I cant see anything from my telescope


In the DAY TIME? Take the scope out in the day time, put the eyepiece with the largest number written on it into the focuser-- DO NOT use the 2x barlow. Practice focusing on a distant object by turning the focus know right and or left until you get a sharp image.

TAKE the lens cap off-- of course.

Apr 20, 2011 | Bushnell Deep Space 78-9003 (525 x 76mm)...

1 Answer

Just bought a starnavigator 114. Purchased a Barlow lens to use with my 26mm lens, but with the barlow I can't see anything. Do I need to make changes in the lens config. in the Autostar?


The barlow may be too much magnification for that aperture telescope. The higher the magnification the SMALLER the sweet spot is in focus.

Turn the knob slower and also practice focusing during the day time on a distant object.

Mar 30, 2011 | Meade DS-2114 ATS (325 x 114mm) Telescope

1 Answer

I also have a jason mercury 420 telescope and was wondering if you knew where i could find a users manual bc I am having problems with my small lenses. I can see objects with just the telescope lens but...


You are using too much magnification. Put the eyepiece with the largest number written on it into the telescope. DO NOT use the 2x barlow if you have one. Take it outside during the day time and practice focusing on a distant object.

Sep 24, 2010 | Telescopes

1 Answer

I have no manual for my galaxsee 45-060525


This is a simple small refractor telescope. Put the eyepiece with the largest number written on it into the telescope. DO NOT USE the 2 x barlow if you have one.

Practice focusing on a distant object during the daytime- you are not focusing the scope properly.

Here is Tasco's manuals web site:
http://www.scribd.com/doc/11827347/Tasco-Telescope-Manual

Jun 24, 2010 | Bushnell Tasco Telescope Galaxsee 525x60mm...

1 Answer

I have the 40-060660 microscope and have it almost put together-- except for the barlowe lens and erecting eyepiece. I just can't figure out what goes where?


You mean TELESCOPE not microscope.

Do NOT use the 2 x barlow.

Put the diagonal into the telescope, then put the eyepiece with the largest number written on it into the diagonal. Go outside during the day time and practice focusing on a distant object.

Read my TIPS on my profile page.

Feb 10, 2010 | Tasco Luminova 40060660 (660 x 60mm)...

1 Answer

How do i connect the barlow lens to my f70076


The barlow is inserted into the diagonal and then the eyepiece is inserted into the barlow.

Try this during the day and practice focusing oin a distant object. I think you will discover that using the barlow gives to much magnification, and makes focusing very difficult.

Put the eyepiece with the largest number written on it into the diagonal WITHOUT using the barlow and note how much easier it is to focus.

The maximum magnification for any telescope is 50 times aperture. So a 4 inch scope is 200 power. Usually you will never be able to get 50 times but only 30-40 times due to turbulence in the atmosphere.

Nov 30, 2009 | Telescopes

1 Answer

I don't know how to work my telescope I don't understand what the 3x barlow goes and what it is for I cant' see anything I tried to set up the crosshairs with the lens but can't figure it out and I have no...


It multiplies the normal magnification of each eyepiece THREE times! In your small telescope you will probably never be able to use it. Magnification is the least important quality of a telescope.

Use the eyepiece with the largest number written on it, which is your LOWEST magnification. Practice focusing on a distant object during the day time. At night the moon should be your first target.

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1 Answer

I have a sky watcher reflector scope. I would like to look at the planes, when I set it up with my barlows and 25 magnification, it still just looks like a bright star what am I doing wrong? Do I need a...


DO NOT USE THE barlow. Put the eyepiece with the largest number written on it into the telescope. Practice focusing on a distant object during the day time.

Oct 13, 2009 | Telescopes

1 Answer

Cannot see anything out of main telescope


Do NOT use the barlow lens-- put the lowest magnification eyepiece into the scope-- practice focusing on the moon -- turn the focus knob slowly in and out until you get a sharp image.

Telescopes only show an area of sky about 1 degree wide or LESS--- this is about the size of the TIP of your finger held at arms length................ your scope is best used at low magnification.

Dec 30, 2008 | Edu-Science (10166) Telescope

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