Best Barlow Lenses in 2026: 10 Picks for 2x, 3x and 5x

The best Barlow lens for most telescopes is the Celestron X-Cel LX 2x. It has three elements, a brass compression ring and a 1.25-inch barrel that doubles the power of any eyepiece you own. For a tight budget, buy the SVBONY 2x, which also takes a camera. For more power on a fast scope, buy the X-Cel LX 3x or the Astromania 5x. If you use 2-inch eyepieces, buy the Celestron Luminos 2.5x. For planetary imaging, the Tele Vue 2x Powermate is the best of the ten.

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The right Barlow depends on your eyepiece barrel size, your telescope type and how much power your scope can use. Pick your barrel and scope type in the checker below to see the Barlows that fit. Enter your telescope and eyepiece focal lengths to see the magnification each Barlow gives and which ones go past your scope’s limit.

What a Barlow lens does

A Barlow lens sits between the eyepiece and the telescope and multiplies the focal length of the telescope, so every eyepiece gives 2x, 3x or 5x its normal magnification. The eyepiece keeps its eye relief, which is why a 20mm eyepiece behind a 2x gives the power of a 10mm with the comfort of the 20mm. Our guide to Barlow lenses covers how they work and how to use one. This page is about which one to buy.

A 2x turns a 25mm, a 10mm and a 6mm eyepiece into six magnifications. Whether that beats buying more eyepieces depends on your kit, and our Barlow lens vs eyepiece comparison covers it. One caution applies to every Barlow: it adds glass to the light path, so a poor one adds color fringes and reflections.

How to choose a Barlow lens

Six things decide which Barlow to buy: magnification, your scope’s power limit, barrel size, optical design, how it pairs with your eyepieces and what you will use it for.

2x vs 3x vs 5x

A 2x suits almost everyone. It works on every telescope type, fits the widest range of eyepiece pairings and keeps the image bright. A 3x suits fast telescopes, such as an f/5 Dobsonian or a short refractor, where 3x still gives a usable focal ratio. A 5x is a planetary tool for large apertures and steady air.

The focal ratio shows why. A Barlow multiplies it: a 2x turns f/5 into f/10, and a 5x turns it into f/25. On an f/10 Schmidt-Cassegrain or Maksutov, a 3x reaches f/30 and a 5x reaches f/50, which almost never resolves anything. A 2.5x, such as the Luminos, is an in-between step that mostly suits owners of 2-inch eyepieces.

Maximum useful magnification

A telescope can use about 50x per inch of aperture, or 2x per millimeter. A 130mm telescope tops out near 260x, a 70mm refractor near 140x and an 8-inch Dobsonian near 400x on paper. On most nights the atmosphere caps useful power at 200x to 300x whatever the aperture. Beyond the limit the image gets larger and softer, with no new detail.

You can turn that into a buying rule. The shortest eyepiece you can use behind a Barlow is the focal ratio multiplied by the Barlow factor, divided by two. On an f/5 scope that is 5mm behind a 2x, 7.5mm behind a 3x and 12.5mm behind a 5x. On an f/10 scope it is 10mm behind a 2x, 15mm behind a 3x and 25mm behind a 5x. A shorter eyepiece passes the limit.

Here is a worked case with a 130mm f/5 telescope (650mm focal length, limit about 260x). A 25mm eyepiece gives 26x and a 10mm gives 65x. Behind a 2x they give 52x and 130x. Behind a 3x they give 78x and 195x. Behind a 5x the 25mm gives 130x and the 10mm gives 325x, which is past the limit. The checker above runs this calculation for your scope. For eyepiece-only numbers, use our telescope magnification calculator.

1.25-inch or 2-inch barrel

Match the Barlow to your eyepiece barrels, not only to your focuser. Almost every beginner telescope and most eyepieces use the 1.25-inch size, and seven of the ten picks here are 1.25-inch-only. A 2-inch Barlow takes 2-inch eyepieces, which pass a wider field of view. The Luminos, the Astromania 2-inch and the Powermate also take 1.25-inch eyepieces through an adapter. The cost is weight: the Luminos and the Astromania 2-inch each weigh about 11 oz, against 2.5 to 6.4 oz for the 1.25-inch picks. Buy a 2-inch Barlow only if you own 2-inch eyepieces or plan to.

On a refractor, SCT or Maksutov the Barlow goes into the star diagonal, so the diagonal’s barrel size must match as well. Our star diagonals guide covers that side.

Elements: achromat and apochromat

Elements are the individual lenses inside the Barlow. A two-element Barlow is one achromatic doublet. Three and four-element designs add a correcting lens or group, which reduces color fringing and edge aberrations. Makers use “apochromatic” loosely for Barlows, so read it as a claim about color correction, not a standard. Celestron lists the X-Cel LX as three-element apochromatic, the Omni and the SVBONY as two elements, and the Luminos and the Astromania 5x as four.

More elements matter most at high power, on fast scopes and with good eyepieces. At 2x with budget eyepieces on an f/10 telescope, a two-element Barlow performs close to a three-element one. The listings for the Tele Vue 2x, the Astromania T-thread 2x and the Astromania 2-inch do not state an element count, so we do not quote one. Coatings matter too. Fully multi-coated optics with blackened edges cut the reflections that cheap Barlows add.

Match the Barlow to your eyepieces and telescope

Your image is only as good as the weakest part of the chain: telescope, eyepiece, Barlow. A premium Barlow cannot rescue a small telescope or poor eyepieces, and a budget Barlow will hold back a Tele Vue eyepiece. Pick a Barlow in the same price range as your eyepieces. If you still use the eyepieces that came with a budget telescope, the SVBONY or the Celestron Omni is the right match. If you own premium eyepieces and a high-quality refractor, the Tele Vue is.

Barlow lens vs telecentric focal extender

A telecentric focal extender, such as the Tele Vue Powermate, does the same job as a Barlow with a different optical design. In a Barlow, the magnification changes with the distance between the Barlow and the eyepiece or sensor. A telecentric extender holds magnification nearly constant at any distance behind it, adds less vignetting and fewer edge aberrations, and handles long-focal-length eyepieces and camera sensors better. It costs about as much as a premium eyepiece.

For visual use, a good Barlow is enough, and the Powermate is hard to justify. For planetary imaging, or when a 2-inch Barlow vignettes, the Powermate is worth the money. Our focal extender vs Barlow lens article compares the two in more detail.

Best Barlow lens for planetary imaging

Barlows are an imaging tool for the Moon and planets, because those targets are small and need a long focal length. Deep-sky imaging wants less focal length, not more, so a Barlow is the wrong tool there.

Choose the Barlow factor from your camera. A common target focal ratio for planetary imaging is about 3 to 5 times the pixel size in microns. A camera with 3.75 micron pixels works best at roughly f/11 to f/19. An f/5 Dobsonian reaches f/15 with a 3x, and an f/10 scope reaches f/20 with a 2x, at the top of that range. Most planetary cameras have a 1.25-inch nosepiece and slide into a Barlow like an eyepiece.

A DSLR or mirrorless camera needs a T-thread. The SVBONY 2x and the Astromania 2x have an M42x0.75 male thread, and a T-ring for your camera brand connects them. The T-ring is a separate purchase, and the accessories below include one. The Tele Vue 2x Powermate is the premium imaging option.

Barlow lenses on Newtonians and Dobsonians

Every Barlow here suits a Newtonian or a Dobsonian. Many Dobsonians are f/5 or faster, so they take a 3x well, and a large mirror can use a 5x on a steady night. The two 2-inch Barlows suit Dobsonians because those scopes often have 2-inch focusers and owners tend to buy 2-inch eyepieces. Our best eyepieces for Dobsonian telescopes list covers the other half of the pairing.

Focus travel is the one Newtonian issue. Some Newtonians have little inward focuser travel, and a camera on a T-adapter alone may not reach focus. Astromania’s listing says its short T-thread 2x helps in that case. If your camera will not reach focus, a short Barlow is an inexpensive thing to try. Check your focuser’s travel before you buy the Powermate for a Newtonian.

Our Dobsonian vs Newtonian guide explains the two scope types. If you are choosing a small scope, see our best tabletop telescopes and travel and portable telescopes lists. Most of those scopes are short and fast, and they take a 2x or 3x well.

How to pair a Barlow with your eyepieces

The goal is to fill the gaps in your magnification range without passing your scope’s limit. Work through it in four steps.

• List your eyepieces and the magnification each gives. Divide your telescope’s focal length by each eyepiece focal length.
• Find your limit: 2x your aperture in millimeters.
• Pick the Barlow factor that lands your longer eyepieces between your current steps. A 2x does that for most kits.
• Check the highest result against the limit. If it passes, choose a lower factor or skip that pairing.

A common beginner kit is a 25mm and a 10mm. Behind a 2x they act like a 12.5mm and a 5mm. The 25mm gives the medium power you were missing, and the 10mm gives a high power for the Moon and planets. A 3x or 5x needs a longer eyepiece to stay in range: a 3x suits a 15mm or a 25mm, and a 5x suits a 25mm or longer on most scopes. The best telescope eyepiece set, best budget telescope eyepieces and best Celestron telescope eyepieces guides list good partners, and our Plossl vs Super Plossl article explains the eyepiece type most kits use.

Eyepiece eye relief stays the same behind a Barlow, so it is a cheap way to get high power with a comfortable eyepiece, especially for glasses wearers and children. You can stack two Barlows of the same barrel size, but that multiplies power fast, adds aberration and almost always passes the limit.

The best Barlow lenses in 2026

These ten are the Barlows and focal extenders sold on Amazon US in October 2026, chosen from what astronomy review sites, retailers and owner reviews recommend. We have not tested them hands-on. The notes draw on published specifications, and where a listing does not state a spec we leave it out. Orion has closed, so the Orion 5x on our old list is gone, and the old SVBONY 2x is discontinued.

Best overall: Celestron X-Cel LX 2x

Best overall

Best for: The one 2x Barlow most owners never need to replace

Magnification

2x

Barrel

1.25"

Elements

3

Design

Barlow

T-thread

No

Length

70 mm

Weight

159 g

Coatings

Fully multi-coated

Pros

• Three-element apochromatic optics keep color clean
• Brass compression ring does not mark eyepiece barrels
• Rubber grip helps with gloves and cold hands

Cons

• Orange styling clashes with non-Celestron gear
• Costs about twice an entry-level 2x
• 1.25-inch eyepieces only

Celestron lists 3-element apochromatic, fully multi-coated optics, a filter-threaded barrel, 7 cm optical length and 5.6 oz.

Check price on Amazon

The X-Cel LX 2x is the Barlow to buy if you want one you do not replace. Celestron lists three-element apochromatic optics with full multi-coating. The barrel is filter-threaded and the body has a brass compression ring and a rubber grip, which helps with gloves on a cold night. It is about 7 cm long and weighs 5.6 oz.

It costs roughly twice as much as an entry-level 2x, and the orange styling stands out against non-Celestron gear. It fits 1.25-inch eyepieces only. For a lower price, the SVBONY and the Omni below are the alternatives. Our Celestron Omni 2x review covers its cheaper sibling.

Best 3x: Celestron X-Cel LX 3x

Best 3x

Best for: Fast, short-focal-length scopes that need more than 2x

Magnification

3x

Barrel

1.25"

Elements

3

Design

Barlow

T-thread

No

Length

Not listed

Weight

150 g

Coatings

Fully multi-coated

Pros

• Same three-element apochromatic optics as the 2x
• Fills the gap between a 2x and a 5x
• Filter-threaded barrel and brass compression ring

Cons

• 3x is too much for slow f/10 scopes in average seeing
• Fewer owners use a 3x than a 2x
• 1.25-inch eyepieces only

3-element apochromatic, fully multi-coated, brass compression ring, rubber grip, 0.15 kg per the Amazon listing. Length is not listed.

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The 3x is the same build as the 2x with triple magnification, and Celestron pitches it at fast, short-focal-length telescopes. On an f/5 Dobsonian it gives f/15, a comfortable planetary focal ratio. On an f/10 SCT or Maksutov it gives f/30, which is too much on most nights.

Most owners use a 2x more than a 3x, so buy this one as a second Barlow or if you have a fast scope and long eyepieces. Amazon lists 0.15 kg and does not give a length.

Best budget: SVBONY 2x

Best budget

Best for: The cheapest 2x that also takes a camera

Magnification

2x

Barrel

1.25"

Elements

2

Design

Barlow

T-thread

Yes

Length

75 mm

Weight

91 g

Coatings

Multi-coated (broadband green film)

Pros

• Among the lowest prices for a metal 2x
• M42x0.75 thread connects a camera through a T-ring
• Light at about 91 g

Cons

• Two elements show more color than the three and four-element Barlows at high power
• Setscrew clamp rather than a compression ring
• Budget coatings lose some contrast

Two elements, broadband multi-coating, 2.96 in optical length, 3.2 oz per Amazon. The T-ring is sold separately.

Check price on Amazon

The SVBONY 2x is the cheapest 2x on this list. It is a two-element, multi-coated Barlow in a black aluminum body, and it weighs about 91 g. The lower end has an M42x0.75 thread, so it works as a camera adapter with a T-ring. It replaces the older SVBONY 2x that Amazon no longer sells.

Two elements show more color at high power than the three and four-element Barlows, and the setscrew clamp is less refined than a compression ring. That is a fair trade with budget eyepieces and a small scope. Our SVBONY Barlow lens review has more on the brand.

Best for beginners: Celestron Omni 2x

Best for beginners

Best for: A first Barlow from a known brand with US support

Magnification

2x

Barrel

1.25"

Elements

2

Design

Barlow

T-thread

No

Length

74 mm

Weight

80 g

Coatings

Fully multi-coated, blackened edges

Pros

• Celestron brand and two-year US warranty
• Short and light at about 80 g
• Filter thread on the barrel

Cons

• Two elements, so more color fringing at high power
• Setscrew clamp, not a compression ring
• Plain finish with no grip band

Fully multi-coated optics with blackened edges, 2.91 in length and 0.08 kg per the Amazon listing.

Check price on Amazon

The Omni 2x is the first Barlow for most beginners. It has two fully multi-coated elements with blackened edges, a threaded barrel for 1.25-inch filters and a two-year Celestron warranty. At about 80 g it is light and short, and it keeps your eyepiece eye relief.

It uses a setscrew clamp and has no grip band, and the two-element design shows more color than the X-Cel LX at high power. Read our Celestron Omni 2x Barlow lens review for a closer look.

Best for imaging and short focus: Astromania 2x T-thread

Best for imaging and short focus

Best for: Webcam and DSLR work, and Newtonians that run out of focus travel

Magnification

2x

Barrel

1.25"

Elements

Not listed

Design

Barlow

T-thread

Yes

Length

Not listed

Weight

71 g

Coatings

Multi-coated

Pros

• T-thread attaches a camera through a T-ring
• Short body, which the listing says helps where a T-adapter alone cannot reach focus
• Filter thread and two locking thumbscrews

Cons

• Lesser-known brand with little independent testing
• Light at about 71 g, so a heavy camera needs support
• Element count and length are not on the listing

M42x0.75 male thread, 1.25-inch filter thread, CNC aluminum, 2.5 oz per Amazon. Element count and length are not stated.

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This Astromania 2x is a short Barlow with an M42x0.75 male thread for a T-ring and a DSLR or mirrorless camera. It also has a filter thread and two locking thumbscrews. The listing says it solves cases where a T-adapter alone will not reach focus, which matters on a Newtonian.

The brand has little independent testing, and the listing does not state the element count or length. It weighs about 71 g, so a heavy camera needs support. It is a low-cost way to start lunar and planetary imaging with a camera body.

Best 5x: Astromania 5x

Best 5x high power

Best for: Planet detail on a short-focal-length scope in steady air

Magnification

5x

Barrel

1.25"

Elements

4

Design

Barlow

T-thread

No

Length

Not listed

Weight

159 g

Coatings

Multi-coated

Pros

• Four-element design
• Brass compression ring and rubber grip
• Fills the 5x slot left by the closed Orion

Cons

• 5x is unusable on slow scopes and in poor seeing
• Little independent testing of this brand
• Needs a long-focal-length eyepiece behind it to stay in range

1.25 inch, 4 elements, 5.6 oz per Amazon, threaded for filters. Length is not listed.

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The Astromania 5x has four elements, a brass compression ring and a filter thread. It fills the 5x slot left by the closed Orion. Use it for planets at the end of a steady night, on a scope with 120mm of aperture or more and a short focal ratio. On an f/5 Dobsonian it gives f/25, which is usable. On an f/10 SCT it gives f/50, which almost never resolves anything.

It needs a long-focal-length eyepiece behind it, 12.5mm or more on an f/5 scope, to stay inside the power limit. The brand has little independent testing, and Amazon does not list a length. Weight is 5.6 oz.

Best 2-inch Barlow: Celestron Luminos 2.5x

Best 2-inch Barlow

Best for: Owners of 2-inch eyepieces, mostly on Dobsonians

Magnification

2.5x

Barrel

2" and 1.25"

Elements

4

Design

Barlow

T-thread

No

Length

Not listed

Weight

318 g

Coatings

Fully multi-coated

Pros

• Takes both 2-inch and 1.25-inch eyepieces
• Four-element optics with a flat field
• 2-inch filter thread

Cons

• 2.5x is an in-between power with fewer clean pairings
• Heavy at about 11 oz
• Needs 2-inch eyepieces to be worth buying

4 elements, fully multi-coated, brass compression ring, 11.2 oz per Amazon, 2-inch to 1.25-inch adapter included. Length is not listed.

Check price on Amazon

The Luminos 2.5x takes both 2-inch and 1.25-inch eyepieces, with a 2-inch to 1.25-inch adapter in the box. Celestron lists four elements, a flat field, a barrel threaded for 2-inch filters and large thumbscrews that work with gloves. It suits a Dobsonian with a 2-inch focuser and a set of 2-inch eyepieces.

At 11.2 oz it is heavy, and 2.5x is an in-between power that gives fewer clean pairings than a 2x or a 3x. Buy it only if you own 2-inch eyepieces.

Best budget 2-inch Barlow: Astromania 2-inch 2x ED

Best budget 2-inch Barlow

Best for: A cheaper 2-inch Barlow for Dobsonians and large refractors

Magnification

2x

Barrel

2" and 1.25"

Elements

Not listed

Design

Barlow

T-thread

No

Length

Not listed

Weight

325 g

Coatings

Fully multi-coated, ED glass

Pros

• Handles 2-inch eyepieces for less than the Tele Vue
• ED glass and multi-coating
• Includes a 2-inch to 1.25-inch adapter

Cons

• Lesser-known brand with few independent tests
• Element count is not stated on the listing
• Heavy at about 11.5 oz

ED glass, fully multi-coated, 2-inch filter thread, 11.46 oz per Amazon. Element count and length are not listed.

Check price on Amazon

This is the cheaper way to use 2-inch eyepieces behind a 2x. It uses ED glass and full multi-coating, with a 2-inch filter thread. A 2-inch to 1.25-inch adapter is included, so it also takes 1.25-inch eyepieces. The larger lens diameter reduces shadowing with long-focal-length eyepieces and camera sensors.

It weighs about 11.5 oz, the brand has few independent tests and the listing does not state the element count. It costs less than the Tele Vue and suits Dobsonians and larger refractors.

Best premium Barlow: Tele Vue 2x Barlow

Best premium Barlow

Best for: Owners of premium eyepieces who want the Barlow to match

Magnification

2x

Barrel

1.25"

Elements

Not listed

Design

Barlow

T-thread

No

Length

Not listed

Weight

181 g

Coatings

Multi-coated

Pros

• Designed to match Tele Vue eyepieces
• Keeps eyepiece eye relief
• Premium brand with a long record

Cons

• Top price tier for a 2x Barlow
• Gains little over an X-Cel LX 2x with budget eyepieces
• Element count is not stated on the listing

6.4 oz on the Amazon listing; the 5.8 x 2.3 x 1.9 in figure may be the package. Element count is not listed.

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The Tele Vue 2x Barlow is the premium 1.25-inch pick. It keeps eye relief and is designed to match Tele Vue eyepieces. Buy it if your eyepieces are Tele Vue or the same grade and a cheaper Barlow would hold them back. Amazon lists 6.4 oz.

It sits in the top price tier, and with budget eyepieces it gains little over the X-Cel LX 2x. The listing does not state an element count, so we do not quote one.

Best focal extender: Tele Vue 2x Powermate 2-inch

Best focal extender

Best for: Imaging and long-focal-length eyepieces where a Barlow vignettes

Magnification

2x

Barrel

2" and 1.25"

Elements

4

Design

Telecentric focal extender

T-thread

Yes

Length

Not listed

Weight

Not listed

Coatings

Multi-coated

Pros

• Telecentric design reduces vignetting and edge aberrations
• Nearly constant magnification at any distance behind it
• Used for high-resolution planetary imaging

Cons

• Most expensive pick in this guide
• Mainly worth it for imaging or H-alpha solar work
• Check focuser travel before buying for a Newtonian

2x telecentric focal extender for 2-inch focusers. Amazon does not list a reliable weight or length.

Check price on Amazon

The Powermate is a telecentric 2x focal extender, not a Barlow. It keeps magnification nearly constant, adds less vignetting and fewer edge aberrations, and takes 2-inch eyepieces. It is the best choice here for high-resolution planetary imaging and for long-focal-length eyepieces that make a Barlow vignette.

It is the most expensive pick and mainly worth it for imaging or H-alpha solar work. Amazon does not list a reliable weight or length. On a Newtonian, check the focuser’s travel before you buy.

Best Barlow lens by use

• Best Barlow lens for a telescope in general: Celestron X-Cel LX 2x.
• Best 2x Barlow lens: X-Cel LX 2x, with the SVBONY 2x for budget and the Tele Vue 2x for premium eyepieces.
• Best budget Barlow lens: SVBONY 2x.
• Best 5x Barlow lens: Astromania 5x.
• Best Barlow lens for planetary imaging: Tele Vue 2x Powermate, or the Astromania 2x T-thread on a budget.
• Best Barlow lens for a Dobsonian: X-Cel LX 2x or 3x, or the Luminos 2.5x for 2-inch eyepieces.

Barlow lens comparison

This table lists all ten picks side by side. On a phone, scroll sideways.

Useful accessories for a Barlow lens

These four help when you add a Barlow to your setup.

A 12mm eyepiece behind a 2x acts like a 6mm. The SVBONY SV233 is a low-cost eyepiece and filter kit, and its listing shows the exact contents. The T-adapter and the T-ring connect a camera behind a Barlow. The Canon ring is listed here, and Nikon, Sony and other camera brands each need their own.

Which Barlow lens should you buy?

• Most people: Celestron X-Cel LX 2x.
• Tight budget: SVBONY 2x.
• First Barlow from a known brand: Celestron Omni 2x.
• Fast scope that needs more than 2x: Celestron X-Cel LX 3x.
• Planets on a short-focal-length scope in steady air: Astromania 5x.
• 2-inch eyepieces: Celestron Luminos 2.5x, or the Astromania 2-inch 2x on a budget.
• Premium eyepieces: Tele Vue 2x Barlow.
• Planetary imaging with a camera: Tele Vue 2x Powermate, or the Astromania 2x T-thread on a budget.
• Camera on a Newtonian that will not focus: Astromania 2x T-thread.

Still choosing a telescope? Take the Telescope Finder, which asks about who it is for, what you want to see and your budget. For planet-focused scopes, see our best telescopes for viewing planets. If your Barlow gives a dim or soft image, read how to troubleshoot a Barlow lens.

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