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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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  • 34mm 68° field argon-purged waterproof 2" eyepiece
    Save $120.05 Save $0.00
    $419.99
    $419.99 - $419.99
    $419.99
    $299.94
    $299.94 - $299.94
    $299.94

    Explore Scientific 34mm 68° Field Argon-Purged Waterproof 2" Eyepiece

    Explore Scientific
    In Stock

    This Explore Scientific 34mm argon-purged 2" is a big eyepiece - big in size, big in weight, big in field of view, big in performance. It gives you...

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    $419.99
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    $419.99
    $299.94
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    $299.94
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  • Save $100.05 Save $0.00
    $999.99
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    $999.99
    $899.94
    $899.94 - $899.94
    $899.94

    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
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    $999.99
    $899.94
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    $899.94
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  • 19mm 2" 82° Luminos
    $189.95 - $189.95
    $189.95
    $189.95 - $189.95
    $189.95

    Celestron 19mm 2" 82° Luminos Eyepiece

    Celestron
    In Stock

    This exceptional Celestron 19mm Luminos ultra wide field 2" eyepiece uses six optical elements for optimized performance across a very wide and fla...

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    $189.95 - $189.95
    $189.95
    $189.95 - $189.95
    $189.95
  • 5.5mm 100° field argon-purged waterproof 2" eyepiece
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    $549.99
    $549.99 - $549.99
    $549.99
    $449.94
    $449.94 - $449.94
    $449.94

    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
    $449.94
    $449.94 - $449.94
    $449.94
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  • 31mm 2" 82° Luminos
    $279.95 - $279.95
    $279.95
    $279.95 - $279.95
    $279.95

    Celestron 31mm 2" 82° Luminos Eyepiece

    Celestron
    In Stock

    This 2" Celestron 31mm Luminos is an excellent low power eyepiece with an exceptionally wide field of view, one so wide you have to move your head ...

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    $279.95 - $279.95
    $279.95
    $279.95 - $279.95
    $279.95
  • Save $100.05 Save $0.00
    $799.99
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    $799.99
    $699.94
    $699.94 - $699.94
    $699.94

    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
    $699.94
    $699.94 - $699.94
    $699.94
    Save $100.05 Save $0.00
  • 9mm 120° field argon-purged waterproof 2" eyepiece
    $1,299.99 - $1,299.99
    $1,299.99
    $1,299.99 - $1,299.99
    $1,299.99

    Explore Scientific 9mm 120° field argon-purged waterproof 2" eyepiece

    Explore Scientific
    More on the way

    A first from Explore Scientific, this 2" 9mm deep sky eyepiece has an immense 120° field that seems to make your telescope disappear and plunge you...

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    $1,299.99
    $1,299.99 - $1,299.99
    $1,299.99
  • Save $100.05 Save $0.00
    $679.99
    $679.99 - $679.99
    $679.99
    $579.94
    $579.94 - $579.94
    $579.94

    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
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    $679.99
    $579.94
    $579.94 - $579.94
    $579.94
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  • 2" 48mm Brandon
    $375.00 - $375.00
    $375.00
    $375.00 - $375.00
    $375.00

    Vernonscope 2" 48mm Brandon Eyepiece

    Vernonscope
    More on the way

    The 2" 48mm Vernonscope Brandon eyepiece is designed for nigh-perfect low power deep sky observing with any telescope type that can use 2" eyepiece...

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    $375.00 - $375.00
    $375.00
    $375.00 - $375.00
    $375.00
  • Save $50.00 Save $0.00
    $399.00
    $399.00 - $399.00
    $399.00
    $349.00
    $349.00 - $349.00
    $349.00

    Pentax 30mm XW Extra Wide Angle 2" Eyepiece

    Pentax
    In Stock

    This medium focal length 2" Pentax eyepiece is an excellent choice for medium power deep space observing with long focal length refractors, reflect...

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    $399.00
    $399.00 - $399.00
    $399.00
    $349.00
    $349.00 - $349.00
    $349.00
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  • Save $50.95 Save $0.00
    $479.95
    $479.95 - $479.95
    $479.95
    $429.00
    $429.00 - $429.00
    $429.00

    Pentax 16.5mm XW Extra Wide Angle Eyepiece

    Pentax
    More on the way

    This medium focal length Pentax is a dual-purpose eyepiece for both terrestrial and astronomical observing. Terrestrially, it is an excellent moder...

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    $479.95
    $479.95 - $479.95
    $479.95
    $429.00
    $429.00 - $429.00
    $429.00
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  • Save $40.00 Save $0.00
    $239.95
    $239.95 - $239.95
    $239.95
    $199.95
    $199.95 - $199.95
    $199.95

    Astro-Tech 21mm UWA 82° 2" Eyepiece

    Astro-Tech
    More on the way

    This Astro-Tech 21mm waterproof eyepiece is a substantial 2" eyepiece that will give impressively sharp and contrasty wide field views of nebulas, ...

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    $239.95
    $239.95 - $239.95
    $239.95
    $199.95
    $199.95 - $199.95
    $199.95
    Save $40.00 Save $0.00
  • 23mm 2" 82° Luminos
    $239.95 - $239.95
    $239.95
    $239.95 - $239.95
    $239.95

    Celestron 23mm 2" 82° Luminos Eyepiece

    Celestron
    In Stock

    This 2" Celestron Luminos 23mm eyepiece is a six-lens design with a very wide 82° field and minimal field curvature. This makes it particularly wel...

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    $239.95 - $239.95
    $239.95
    $239.95 - $239.95
    $239.95
  • Save $50.00 Save $0.00
    $429.00
    $429.00 - $429.00
    $429.00
    $379.00
    $379.00 - $379.00
    $379.00

    Pentax 40mm XW Extra Wide Angle 2" Eyepiece

    Pentax
    In Stock

    This long focal length 2" Pentax eyepiece is outstanding for low power/wide field astronomical observing with long focal length refractors and cata...

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    $429.00
    $429.00 - $429.00
    $429.00
    $379.00
    $379.00 - $379.00
    $379.00
    Save $50.00 Save $0.00
  • Save $50.95 Save $0.00
    $499.95
    $499.95 - $499.95
    $499.95
    $449.00
    $449.00 - $449.00
    $449.00

    Pentax 23mm XW Extra Wide Angle Eyepiece

    Pentax
    In Stock

    This medium focal length Pentax provides sharp and very wide field images for both terrestrial and astronomical observing. Terrestrially, it is an ...

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    $499.95
    $499.95 - $499.95
    $499.95
    $449.00
    $449.00 - $449.00
    $449.00
    Save $50.95 Save $0.00
  • $279.95 - $279.95
    $279.95
    $279.95 - $279.95
    $279.95

    Celestron Ultima Edge 30mm 2" Eyepiece 93454

    Celestron
    More on the way

    Highlights 30mm parfocal Ultra Flat Field eyepiece designed for 2” focusers Incredibly crisp views from center to edge of field Fully multi-coated...

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    $279.95 - $279.95
    $279.95
    $279.95 - $279.95
    $279.95
  • $124.95 - $124.95
    $124.95
    $124.95 - $124.95
    $124.95

    Celestron Omni 56mm 2" Plossl 93328

    Celestron
    More on the way

    Highlights Ultra-long 56mm focal length provides low power views in telescopes with a long focal length, perfect for viewing wide-field deep sky o...

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    $124.95 - $124.95
    $124.95
    $124.95 - $124.95
    $124.95

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