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The reason we do is because more powerful Barlows don’t work well with smaller telescopes. Small scopes don’t pull in much light, so powerful Barlows deliver dim, disappointing images.

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Zoom lenses provide a variable amount of magnification, whereas Barlow lenses have a fixed magnification level. Also, Barlow lenses generally have a smaller field of view than zoom eyepieces.

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Barlowlens vs eyepiece

You might know that the magnification of a telescope is the focal length of objective divided by the focal length of the eyepiece.

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Their changing focal length makes it harder to correct for aberrations, so zoom lenses have a combination of at least 4 glass elements. This makes them bigger and heavier than Barlow lenses.

Barlow lensesreview

As backyarder astronomers, we have a big interest in equipment that makes our stargazing better without burning a hole in our pockets! The humble Barlow lens is a great example of such a piece of kit.

One final advantage is that Barlows do not change the longer eye relief typical of lower power eyepieces (in fact, they actually increase it some in some cases). This allows eyeglass wearers to see a full field of view at high power without removing their glasses.

Barlowlens 5x

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Lower-priced Barlows have fewer or lower quality lenses. These can show minor astigmatism and spurious color at the field edges with fast (smaller than f/6) focal ratio scopes.

How to installBarlowlens in telescope

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Electro-Optix, Inc.2181 N Powerline Rd, Pompano Beach FL 33069You can reach us by telephone: (954) 973-2800Or contact us toll-free at: 1-800-779-2801You can contact us via fax: (954) 973-3951Office hours are Monday-Friday EST 9:00AM to 5:00PM

Instead of inserting an eyepiece into the focuser, you place in the Barlow lens. Your eyepiece is then inserted into the Barlow, like the example, left, from Celestron.

What isBarlowlens in telescope

The diagram shows an effective increase in telescope focal length – the yellow light cone’s point is further along from the ‘diverging lens’ than the gray light cone’s point. The longer focal length of the yellow light cone is due to the impact of the Barlow lens.

But, since a Barlow is normally used to look at objects at high power in the center of the field (where the image is unaffected), this is not a dealbreaker.

Using a 20mm eyepiece on a telescope with a 1000mm focal length gives 50x magnification (1000mm / 20mm). Attach a 2x Barlow lens to that same eyepiece and you double its magnification to 100x!

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The lenses used in SLR and DSLR cameras to vary the focal length (and hence zoom) are zoom lenses. Given below is an image taken while varying the focal length of a camera using a zoom lens:

Their effect is to increase the magnification of any eyepiece used with them, usually 2 or 3 times. As you’d expect, a 2x Barlow doubles your eyepiece magnification, whilst a 3x trebles it.

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They contain a concave lens that is placed between your telescope’s objective lens or mirror and eyepiece. (Actually, they contain more than one glass element to reduce chromatic aberration).

We believe you’ll be better off with a decent Barlow lens most of the time, especially early on in your stargazing career, when simplicity and cost are big concerns.

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Barlowlens Celestron

Barlow lenses come in different magnifications. The most common are 2x, but lenses that offer 3x or 5x are also available.

This video by David Fuller of Eyes on the Sky explains Barlow lenses in detail, including how to use them, and the types of Barlow which are available:

For instance, if you have a 30mm, 24mm and 10mm eyepiece, having a Barlow in your collection effectively adds a 15mm, 12mm and 5mm eyepiece to your collection. Since one decent Barlow lens is much cheaper than three new eyepieces, it is really cost effective!

A Barlow lens is a tremendously useful instrument to have in your collection. In fact, we think they are an essential piece of equipment for every backyard astronomer!

One thing to keep in mind while buying a Barlow lens is that if it fits the tube of your eyepiece. Most tubes come in one of two standard sizes, either 1.25 or 2 inch, so finding the one that fits won’t be a problem. You just need to make sure to get the right one.

• Anti Magnetic • Esd-Safe • Static Dissipative • Precision Point Tweezers• Anti Acid• Non Corrosive-Non Glare• Non Corrosive-Non Glare • Stainless Steel •Rockwell Hardness 40HRC

You can Email us:For sales and wholesale information -sales@electro-optix.comFor post-sales support questions -sales@electro-optix.com

Barlowlens 2x

It’s an essential piece of equipment every astronomer should have but, if you don’t know much about it, then this article will explain everything you need to know.

The Barlow lens was invented in the 19th century by Peter Barlow, A mathematician, optician, astronomer and a member of the Royal Society of London.

Barlowlens 3x

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Crafted with utmost precision, our tweezers feature high-quality hand finished hypoallergenic stainless steel tips that ensure exceptional accuracy. With a Rockwell hardness rating of 40HRC, these tweezers offer remarkable durability and resilience. Additionally, our stainless steel Vetus Tweezers are resistant to acid, making them ideal for various applications. They are also anti-magnetic, providing further protection for sensitive electronic components. The stainless steel construction ensures long-lasting performance and prevents corrosion. To enhance usability and grip, out stainless ESD  tweezers are coated with an ESD black non-glare finish, which adds both comfort and anti-static properties.With our ESD Safe Vetus Tweezers, you can confidently work with static-sensitive devices, components, and semiconductors, knowing that you have reliable, high-quality tools designed to meet the demanding requirements of such applications.