6 Best Gso 2 2x Ed Barlow Lens Compared for Planetary and Deep-Sky Viewing

Updated November 2026

Shopping for a gso 2 2x ed barlow lens usually comes down to one question: will it sharpen the views you already get from your eyepieces, or just make them bigger and dimmer? A 2x ED Barlow doubles the effective focal length of any eyepiece you slide into it, which means higher magnification from the same set of oculars. The lenses below were compared on the points that matter most to observers: the quality of the ED (extra-low dispersion) glass, how well the optics are coated, whether the barrel fits 1.25-inch and 2-inch focusers, how solid the compression ring and lock feel, and what owners consistently say about color fringing and image contrast at high power.

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Quick Comparison

Product	Best for	Key feature
Celestron X-Cel LX 2X Barlow Lens	Balanced all-round use	Fully multi-coated optics with a removable optical cell
AstroStreet 2″ 2X ED Lens Barlow	2-inch focuser setups	50.8 mm barrel with ED glass
Alstar Barlow Lens 2X, 2″ ED	Planetary observing	Broadband green film coating and compression ring
Astromania Barlow Lens 2X, 2 Inch ED	Deep-sky observing	Fully multi-coated dual-power ED design
SVBONY 216 2X Barlow Lens, 1.25″	Budget-conscious beginners	Telecentric design with three-screw eyepiece lock
AstroStreet GSO ED Lens 3X Barlow	Users wanting higher power on 1.25-inch	3x magnification in a 1.25-inch format

Celestron X-Cel LX 2X Barlow Lens

Best for: Balanced all-round use on a 1.25-inch focuser

This is the lens most observers reach for when they want a dependable, well-known name that works across planets, the Moon and bright deep-sky objects. It suits someone who already owns a few eyepieces and wants to double their range without fussing over exotic glass.

Key specs

• 2x magnification factor, 1.25-inch barrel
• Fully multi-coated optics
• Brass compression ring
• Removable optical cell
• Durable housing

Pros

• Brand familiarity and wide availability of support information
• Removable optical cell makes cleaning straightforward
• Brass compression ring holds eyepieces firmly

Cons

• 1.25-inch only, so 2-inch eyepieces need an adapter
• Some owners find it a bit longer than budget alternatives, which can affect focus range

Bottom line: A safe first choice for beginners and intermediate observers who want a reliable 2x that works with standard 1.25-inch eyepieces.

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AstroStreet 2″ 2X ED Lens Barlow 50.8mm

Best for: 2-inch focuser setups that need a large-diameter 2x

Observers with a 2-inch focuser and 2-inch eyepieces will want a Barlow with a matching 50.8 mm barrel, so the light cone is not restricted. It is aimed at people who have already committed to 2-inch accessories.

Key specs

• 2x magnification factor
• 2-inch (50.8 mm) barrel
• ED glass elements

Pros

• Full-aperture light path for 2-inch eyepieces
• ED glass helps reduce color fringing
• Good match for wide-field deep-sky eyepieces

Cons

• Not usable in 1.25-inch-only focusers without adapters
• Heavier than small-barrel Barlows, which can stress lighter diagonals

Bottom line: Best for owners with 2-inch focusers who want a 2x that does not choke off the field.

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Alstar Barlow Lens 2X, 2″ ED

Best for: Planetary observing, especially lunar and planetary detail

Planetary observers care most about contrast and color neutrality at high power. A 2x ED design with broadband coatings is a logical match for that work, and this model is marketed specifically for Moon and planet viewing.

Key specs

• 2x magnification factor, 2-inch barrel with 1.25-inch adapter compatibility
• Fully multi-coated broadband green film
• Compression ring and safety groove
• Large lens diameter

Pros

• Coatings are designed to limit reflections and boost contrast
• Compression ring keeps eyepieces secure during high-power work
• Large lens diameter supports bright, sharp fields

Cons

• Owners report it is best balanced on heavier telescopes rather than very light setups
• Specific coating performance varies with eyepiece pairing, so test with your own oculars

Bottom line: A strong pick if planetary detail is your priority and you have a 2-inch focuser.

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Astromania Barlow Lens 2X, 2 Inch ED

Best for: Deep-sky observing with wide-field eyepieces

Deep-sky observers often run wide-field eyepieces at moderate power and want a Barlow that preserves field flatness and light throughput. This model’s fully multi-coated dual-power ED design is positioned for that use.

Key specs

• 2x magnification factor
• 2-inch barrel, usable with 1.25-inch eyepieces via adapter
• Fully multi-coated ED optics

Pros

• Multi-coating supports light transmission on faint targets
• Dual-power design allows flexibility between 1.25 and 2-inch use
• Works well with wide-field eyepieces common in deep-sky setups

Cons

• Brand is less widely documented than major manufacturers
• Some users note the lens requires careful alignment in the focuser

Bottom line: Good for deep-sky observers who want a 2x that favors light throughput and field quality.

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SVBONY 216 2X Barlow Lens, 1.25″

Best for: Budget-conscious beginners and planetary imagers on 1.25-inch focusers

New observers and planetary imagers often want a 2x that is easy to attach and does not add complexity. The telecentric design and three-screw lock are aimed at secure, repeatable setups, including camera work.

Key specs

• 2x magnification factor, 1.25-inch barrel
• Fully multi-coated (FMC) optics
• Telecentric lens design
• Three-screw design and brass compression ring

Pros

• Three-screw lock keeps eyepieces and cameras steady
• Telecentric design suits photography and planetary work
• Straightforward for newcomers to install

Cons

• 1.25-inch format limits use with larger wide-field eyepieces
• Owners sometimes mention the coatings are not as refined as premium options

Bottom line: A practical budget pick for beginners and for planetary imaging setups on 1.25-inch focusers.

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AstroStreet GSO ED Lens 3X Barlow 1.25 inches

Best for: Users who want more power from 1.25-inch eyepieces

Observers who want to push magnification further than a 2x provides, while keeping a 1.25-inch setup, may consider a 3x. Be aware that higher power also magnifies seeing limitations, so this suits steady, well-collimated scopes.

Key specs

• 3x magnification factor
• 1.25-inch (31.7 mm) barrel
• ED glass elements

Pros

• Triples eyepiece power from a single accessory
• Compatible with the common 1.25-inch format
• ED glass aims to limit color fringing at high power

Cons

• Higher power can make views dim and softer under poor seeing
• Less versatile than a 2x for wide-field and deep-sky use

Bottom line: Choose this if you specifically want 3x power on 1.25-inch eyepieces and understand the trade-offs.

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Buying Guide

Barrel size: 1.25-inch vs. 2-inch

Check your focuser before anything else. A 1.25-inch Barlow fits standard eyepieces, while a 2-inch Barlow fits larger, wide-field oculars and gives an unrestricted light path. Many observers use a 2-inch Barlow with 1.25-inch eyepieces through an adapter, which works but adds length.

Good picks for this: Celestron X-Cel LX 2X Barlow Lens, AstroStreet 2″ 2X ED Lens Barlow

Magnification factor

A 2x Barlow doubles the power of any eyepiece. A 3x triples it. For most objects, a 2x offers a useful balance; a 3x is generally reserved for steady nights and small targets such as planets and double stars.

Good picks for this: Alstar Barlow Lens 2X, 2″ ED, AstroStreet GSO ED Lens 3X Barlow

Optical coatings

Look for “fully multi-coated” or “FMC” descriptions. Coatings reduce surface reflections and help preserve contrast and brightness, which matters most on the Moon, planets and faint galaxies.

Good picks for this: Astromania Barlow Lens 2X, 2 Inch ED, SVBONY 216 2X Barlow Lens

Glass type and color correction

ED (extra-low dispersion) glass helps reduce chromatic aberration, the purple or blue fringing around bright objects. It does not eliminate it entirely, but it is a meaningful upgrade over standard glass in a Barlow.

Good picks for this: AstroStreet 2″ 2X ED Lens Barlow, Alstar Barlow Lens 2X, 2″ ED

Lock mechanism and compression ring

A secure eyepiece lock prevents slippage, which is especially important when you add a camera or run high power. Brass compression rings and three-screw designs are common approaches. Tighten evenly to avoid pinching the barrel.

Good picks for this: Celestron X-Cel LX 2X Barlow Lens, SVBONY 216 2X Barlow Lens

Telescope compatibility and focal ratio

A Barlow lengthens the effective focal length, which can shift focus travel and may cause focusing problems on short-focus or fast telescopes. Check that your focuser has enough inward travel before buying.

Good picks for this: Astromania Barlow Lens 2X, 2 Inch ED, AstroStreet GSO ED Lens 3X Barlow 1.25 inches

Use case: planetary, deep-sky or imaging

Planetary observers want contrast and neutral color at high power. Deep-sky observers want light throughput and field quality. Imagers want a telecentric or camera-friendly design with a stable lock. Match the lens to what you do most.

Good picks for this: Alstar Barlow Lens 2X, 2″ ED, SVBONY 216 2X Barlow Lens

FAQ

What does a 2x Barlow lens actually do?

It sits between the telescope and the eyepiece and roughly doubles the effective focal length, so every eyepiece you use gives twice its normal magnification. The field of view shrinks by about half, and the image gets dimmer by a similar factor.

Is a 2x Barlow better than buying a shorter-focal-length eyepiece?

Not always. A Barlow lets you reuse eyepieces you already own, but a high-quality dedicated eyepiece can sometimes deliver sharper views at the same power. Many observers use both approaches together.

Can I use a Barlow lens with a camera?

Yes, and many Barlows are marketed for imaging. Telecentric designs and stable locks are particularly useful. Check that the lens’s spacing matches your camera’s back focus requirement.

Will a Barlow make my view too dark?

Higher magnification spreads the same light over a larger image, so the view appears dimmer. On bright targets like the Moon and planets this is usually fine; faint deep-sky objects may suffer more.

What is the difference between ED glass and standard glass in a Barlow?

ED glass has lower dispersion, which reduces color fringing around bright objects. The improvement is noticeable on planets and the Moon, though no Barlow removes color fringing entirely.

Do I need a 2-inch Barlow if I only own 1.25-inch eyepieces?

No. A 1.25-inch Barlow matches your existing eyepieces and focuser. A 2-inch model makes sense only if you have a 2-inch focuser or plan to buy 2-inch eyepieces.

Conclusion

For most observers, the Celestron X-Cel LX 2X is the most balanced choice on a 1.25-inch focuser. If you have a 2-inch focuser and wide-field eyepieces, the AstroStreet 2-inch ED model keeps the light path open. Planetary observers may prefer the Alstar 2-inch ED for its coatings, while deep-sky users might look at the Astromania dual-power design. The SVBONY 216 suits beginners and budget-minded imagers, and the AstroStreet 3x is for those who specifically want triple power on 1.25-inch eyepieces. Confirm your focuser size and check focus travel before ordering.

Sources

• Background on telescope optics, magnification and how the Moon and planets are observed (nasa.gov)
• Beginner resources on eyepieces, magnification and observing techniques
• Guidance and educational material from the American Astronomical Society on telescope observing

Related reading

• Top 5 2x or 3x Barlow Lens for Planetary Viewing Compared
• Celestron Omni 2X Barlow Lens Review: Is It Worth It?
• 2x Barlow Lens Celestron Review: Is It Worth It?
• Top 7 Barlow Lens for Astrophotography Compared for Planets and Deep Sky
• Is a Barlow Lens Worth It? 6 Picks Compared for Every Telescope
• Celestron Barlow Lens 3x Review: Is It Worth It?

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