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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 20mm 100° Field Waterproof XWA 2" Eyepiece

    Astro-Tech
    In Stock

    The 100° apparent field of the Astro-Tech 20mm waterproof 2" eyepiece provides superb maximum field/medium power observing in all scopes, from smal...

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    $299.95
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  • $279.95 - $279.95
    $279.95
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    $279.95

    Astro-Tech 13mm 100° Field Waterproof 1.25"/2" Eyepiece

    Astro-Tech
    In Stock

    The Astro-Tech 13mm o-ring sealed 1.25"/2" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropping observing...

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    $279.95
    $279.95 - $279.95
    $279.95

    Astro-Tech 7mm 100° Field Waterproof 1.25"/2" Eyepiece

    Astro-Tech
    In Stock

    The Astro-Tech 7mm o-ring sealed 1.25"/2" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropping observing ...

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    $279.95 - $279.95
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    $279.95
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    $0.00
    $279.95
    $279.95 - $279.95
    $279.95

    Astro-Tech 9mm 100° Field Waterproof 1.25"/2" Eyepiece

    Astro-Tech
    In Stock

    The Astro-Tech 9mm o-ring sealed 1.25"/2" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropping observing ...

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    $279.95
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    $279.95
  • 13mm 1.25"/2" 100° field Ethos
    $693.00 - $693.00
    $693.00
    $693.00 - $693.00
    $693.00

    TeleVue 13mm 1.25"/2" 100° Field Ethos

    TeleVue
    In Stock

    The 100° apparent field of this new TeleVue 13mm Ethos eyepiece provides a field area more than 50% larger than the "space-walking" 82° field of a ...

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  • $941.00 - $941.00
    $941.00
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    $941.00

    TeleVue 21mm 2" 100° Field Ethos Eyepiece

    TeleVue
    In Stock

    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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  • $651.00 - $651.00
    $651.00
    $651.00 - $651.00
    $651.00

    TeleVue 8mm 1.25"/2" 100° Field Ethos Eyepiece

    TeleVue
    In Stock

    The TeleVue 8mm Ethos eyepiece raises the bar for shorter focal length eyepieces. It expands the apparent field of view to an astonishing 100°, whi...

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    $651.00 - $651.00
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    $651.00
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    $651.00
    $651.00 - $651.00
    $651.00

    TeleVue 6mm 1.25"/2" 100° Field Ethos Eyepiece

    TeleVue
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    Just like the 8mm TeleVue Ethos before it, the TeleVue 6mm Ethos eyepiece once again raises the bar for shorter focal length eyepieces. It expands ...

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    $651.00
  • $693.00 - $693.00
    $693.00
    $693.00 - $693.00
    $693.00

    TeleVue 10mm 1.25"/2" 100° Field Ethos Eyepiece

    TeleVue
    In Stock

    The 10mm TeleVue Ethos is a "do-it-all" eyepiece that is perfect for all telescopes that can utilize this focal length. And, as it fills the hole b...

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    $693.00 - $693.00
    $693.00
    $693.00 - $693.00
    $693.00
  • $838.00 - $838.00
    $838.00
    $838.00 - $838.00
    $838.00

    TeleVue 17mm 2" 100° Field Ethos Eyepiece

    TeleVue
    In Stock

    The 17mm TeleVue Ethos 100° field eyepiece is designed for no-holds-barred medium power deep space use with telescopes having focal ratios down to ...

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    $838.00 - $838.00
    $838.00
    $838.00 - $838.00
    $838.00
  • 12mm 92° field argon-purged waterproof 2" eyepiece
    $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99

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

    Explore Scientific
    More on the way

    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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    $799.99 - $799.99
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    $799.99 - $799.99
    $799.99
  • 17mm 92° field argon-purged waterproof 2" eyepiece
    $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99

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

    Explore Scientific
    More on the way

    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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    $799.99 - $799.99
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    $799.99 - $799.99
    $799.99
  • 9mm 100° field argon-purged waterproof 2" eyepiece
    $579.99 - $579.99
    $579.99
    $579.99 - $579.99
    $579.99

    Explore Scientific 9mm 100° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
    In Stock

    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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    $579.99 - $579.99
    $579.99
    $579.99 - $579.99
    $579.99
  • $999.99 - $999.99
    $999.99
    $999.99 - $999.99
    $999.99

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

    Explore Scientific
    In Stock

    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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    $999.99 - $999.99
    $999.99
    $999.99 - $999.99
    $999.99
  • 5.5mm 100° field argon-purged waterproof 2" eyepiece
    $549.99 - $549.99
    $549.99
    $549.99 - $549.99
    $549.99

    Explore Scientific 5.5mm 100° Field Waterproof 2" Eyepiece

    Explore Scientific
    In Stock

    The Explore Scientific 5.5mm argon-purged waterproof 2" eyepiece combines a high power capability with a 100° apparent field to provide a jaw-dropp...

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    $549.99 - $549.99
    $549.99
    $549.99 - $549.99
    $549.99
  • $679.99 - $679.99
    $679.99
    $679.99 - $679.99
    $679.99

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

    Explore Scientific
    In Stock

    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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    $679.99 - $679.99
    $679.99
    $679.99 - $679.99
    $679.99
  • $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99

    Explore Scientific 20mm 100° field waterproof 2" eyepiece

    Explore Scientific
    In Stock

    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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    $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99
  • 30mm 100° field argon-purged waterproof 3" eyepiece
    $1,099.99 - $1,099.99
    $1,099.99
    $1,099.99 - $1,099.99
    $1,099.99

    Explore Scientific 30mm 100° Field Argon-Purged Waterproof 3" Eyepiece

    Explore Scientific
    In Stock

    The 100° apparent field of the Explore Scientific 30mm waterproof 3" eyepiece provides superb maximum field/medium to medium-low power observing in...

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    $1,099.99 - $1,099.99
    $1,099.99
    $1,099.99 - $1,099.99
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