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Eyepieces & Barlows

What is an eyepiece: A telescope collects the light of faint and/or distant objects and forms a fixed-size image of those objects at the telescope’s prime focus. An eyepiece is simply a small microscope that enlarges a portion of that image so you can see more detail.

The importance of good eyepieces: Every photon of light collected by a telescope passes through an eyepiece before it reaches your eye. That light is therefore afflicted by every optical problem in that eyepiece – and the cheaper the eyepiece, the more problems it is likely to have. A $10 eyepiece will make a $2000 telescope perform like a $10 toy. If your telescope’s eyepieces are the simple two-element designs labeled H (Huygenian), R (Ramsden), or SR (symmetrical Ramsden), they are basically toy eyepieces and should be replaced.

Eyepieces are half of your scope’s optical system, and usually the most complex half. They should be at least the same quality as your scope (preferably better). A good telescope won’t improve a poor eyepiece – but a good eyepiece will get the most out of a so-so scope.

What eyepiece should I get first: When buying your first eyepieces, resist the urge to immediately buy the highest powers possible. Very high powers require experienced observers and excellent seeing conditions (dark, clear, steady skies) to get the most from them. Medium power eyepieces, on the other hand, give good images over a much wider range of seeing conditions.

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    Astro-Tech 28mm UWA 82° 2" Eyepiece

    Astro-Tech
    In Stock

    The first time you swap out a standard Plossl for the 28mm UWA, the difference hits you immediately. The field opens up from 50° to 82° — nearly th...

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    $299.95
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    $299.95

    Astro-Tech 20mm 100° Field Waterproof XWA 2" Eyepiece

    Astro-Tech
    In Stock

    Drop this eyepiece into a 12-inch Dobsonian and you'll understand what 100° does to a deep-sky view. The Orion Nebula doesn't just sit in the cente...

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  • 30mm 82° field argon-purged waterproof 2" eyepiece
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    $279.00
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    $279.00

    Explore Scientific 30mm 82° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    This 82° field Explore Scientific 30mm 2" argon-purged waterproof eyepiece gives you the big picture, making you feel like you're relaxing in front...

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    $279.00
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  • 9mm 100° field argon-purged waterproof 2" eyepiece
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    $579.99
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    $299.00
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    Explore Scientific 9mm 100° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    The Explore Scientific 9mm argon-purged waterproof 2" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-droppin...

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    $439.00
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    $229.00
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    $229.00

    Explore Scientific 24mm 82° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    This 82° field Explore Scientific 24mm 2" argon-purged waterproof eyepiece makes observing feel like you're relaxing in front of a picture window o...

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    Explore Scientific 25mm 100° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    The 100° apparent field of this Explore Scientific first-of-its-kind 25mm argon-purged waterproof 2" eyepiece provides superb maximum field/medium ...

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  • $789.00 - $789.00
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    $789.00

    TeleVue 31mm 2" Nagler Type 5 Eyepiece

    TeleVue
    In Stock

    The straightforward way to build a 31mm wide-field eyepiece is to scale up what already works. TeleVue took one look at where that math led — a sev...

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    $679.99
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    $349.00
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    $349.00

    Explore Scientific 14mm 100° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    The 100° apparent field of the Explore Scientific 14mm argon-purged waterproof 2" eyepiece provides incredible maximum field/medium power observing...

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  • $388.00 - $388.00
    $388.00
    $388.00 - $388.00
    $388.00

    TeleVue 2X Powermate Image Amplifier for 2" Eyepieces, with 1.25" Eyepiece Adapter

    TeleVue
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    If you need a very high quality 2x Barlow for 2" eyepieces, look no further than this TeleVue Powermate. While not technically a Barlow, this uniqu...

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    $388.00 - $388.00
    $388.00
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    $388.00
  • 12mm 92° field argon-purged waterproof 2" eyepiece
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    $299.00
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    $299.00

    Explore Scientific 12mm 92° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    This 2" 12mm 92° field Explore Scientific hyper-wide eyepiece provides an exceptionally immersive medium/medium high power observing experience. Yo...

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  • 18mm 82° field argon-purged waterproof 2" eyepiece
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    $319.99
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    $169.00
    $169.00 - $169.00
    $169.00

    Explore Scientific 18mm 82° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    This 82° field Explore Scientific 18mm 2" argon-purged waterproof eyepiece makes observing with many telescopes feel like you're taking a stroll th...

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  • $1,012.00 - $1,012.00
    $1,012.00
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    $1,012.00

    TeleVue 21mm 2" 100° Field Ethos Eyepiece

    TeleVue
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    With a 21mm focal length, the field of this 100° apparent field Ethos eyepiece is nearly 64% larger in area than the 82° field of a "space-walking"...

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  • $159.95 - $159.95
    $159.95
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    $159.95

    Celestron Luminos 2.5X 4-Element Barlow For 2" And 1.25" Eyepieces 93436

    Celestron
    In Stock

    This 2.5x magnification Celestron Luminos 2" Barlow uses a four-lens fully multicoated optical system to provide a flat field and apochromatic-qual...

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  • $431.00 - $431.00
    $431.00
    $431.00 - $431.00
    $431.00

    TeleVue 27mm 2" Panoptic Eyepiece

    TeleVue
    More on the way

    An excellent premium-quality low power wide field 2" eyepiece for the serious deep space explorer. The 27mm Panoptic, for example, will give you a ...

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    $431.00
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    $431.00
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    $499.00
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    $499.00

    Explore Scientific 20mm 100° field waterproof 2" eyepiece

    Explore Scientific
    More on the way

    The 100° apparent field of the Explore Scientific 20mm waterproof 2" eyepiece provides superb maximum field/medium power observing in all scopes, f...

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  • $396.00 - $396.00
    $396.00
    $396.00 - $396.00
    $396.00

    TeleVue 4X Powermate Image Amplifier for 2" Eyepieces, with 1.25" Eyepiece Adapter

    TeleVue
    In Stock

    If you need a very high quality, very high power 4x Barlow for 2" eyepieces, look no further than this TeleVue Powermate. While not technically a B...

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    $396.00 - $396.00
    $396.00
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    $396.00
  • 17mm 92° field argon-purged waterproof 2" eyepiece
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    $299.00
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    $299.00

    Explore Scientific 17mm 92° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    You may be startled at the amazingly wide expanse of inky black sky that greets you when you first look into the 92° field of this Explore Scientif...

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  • $551.00 - $551.00
    $551.00
    $551.00 - $551.00
    $551.00

    TeleVue 22mm 2" Nagler Type 4 Eyepiece

    TeleVue
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    The TeleVue 2" 22mm Nagler Type 4 replaces the 20mm Nagler Type 2, considered by many to be the finest eyepiece ever made. How do you improve on a ...

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    $551.00 - $551.00
    $551.00
    $551.00 - $551.00
    $551.00
  • 28mm 68° field argon-purged waterproof 2" eyepiece
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    $169.00
    $169.00 - $169.00
    $169.00

    Explore Scientific 28mm 68° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
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    This Explore Scientific 28mm argon-purged is a substantial 2" eyepiece that gives impressively sharp and contrasty wide field views of nebulas, com...

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    $299.99
    $169.00
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    $169.00
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  • $239.95 - $239.95
    $239.95
    $239.95 - $239.95
    $239.95

    Astro-Tech 21mm UWA 82° 2" Eyepiece

    Astro-Tech
    In Stock

    You spend half the night swapping eyepieces. A 28mm wide-field for the big nebulae, a 16mm for the tight clusters, and something in between that yo...

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    $239.95
    $239.95 - $239.95
    $239.95
  • $654.00 - $654.00
    $654.00
    $654.00 - $654.00
    $654.00

    TeleVue 41mm 2" Panoptic Eyepiece

    TeleVue
    In Stock

    This is a premium-quality wide field 2" eyepiece for the serious deep space explorer. Because of its long focal length, it is at its best with tele...

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    $654.00 - $654.00
    $654.00
    $654.00 - $654.00
    $654.00
  • 2X Barlow for 2" eyepieces, with 1.25" adapter
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    $299.99
    $149.99
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    $149.99

    Explore Scientific 2X Barlow for 2" eyepieces, with 1.25" adapter

    Explore Scientific
    More on the way

    This new four-element 2" 2x Explore Scientific focal extender (Barlow lens) has a 1.25" eyepiece adapter so you can use both 2" and 1.25" eyepieces...

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    $299.99
    $149.99
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    $149.99
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  • $485.00 - $485.00
    $485.00
    $485.00 - $485.00
    $485.00

    TeleVue 35mm 2" Panoptic Eyepiece

    TeleVue
    In Stock

    An excellent and physically-impressive premium-quality low power wide field 2" eyepiece for the serious deep space explorer. The Tele Vue 35mm Pano...

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    $485.00 - $485.00
    $485.00
    $485.00 - $485.00
    $485.00
  • Explore Scientific 62° 40mm 2" Waterproof Eyepiece
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    $289.99
    $289.99 - $289.99
    $289.99
    $159.00
    $159.00 - $159.00
    $159.00

    Explore Scientific 40mm 62° 2" Waterproof Eyepiece

    Explore Scientific
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    Explore Scientific 40mm 62° 2" Waterproof Eyepiece The Explore Scientific 40mm 62° Series 2" Eyepiece is a superb choice for deep-sky observers and...

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    $289.99
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    $159.00
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