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Eyepieces & Barlows

The first accessories people buy for their telescope are additional eyepieces or a Barlow, to increase the magnification possibilities of their new scope. If you already know all about eyepieces and Barlows, you can click on the appropriate manufacturers below to find descriptions, specifications, pictures, and pricing on all the eyepieces and Barlows we carry.

If you're new to astronomy, or have questions about which eyepieces or Barlows are best for your scope, click on the "How to pick an eyepiece" and "How to pick a Barlow" sections for more practical information about choosing these optical accessories than you really wanted to know.

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Manufacturer: Pentax

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Barrel size for eyepieces and barlows

1.25" (7)
2" (2)

Eyepiece Series

Spotting Scope Accessories

Eyepieces (9)

Eyepiece Focal Length

Eyepiece Field of View Range

51°-60° (1)
61°-70° (8)

Eye Relief

19mm & Up (8)
Variable - Zoom Eyepiece (1)

Spotting Scope Manufacturers

Pentax (9)

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Pentax 3.5mm XW extra wide angle eyepiece

$299.00

3 Review(s)

This very short focal length Pentax eyepiece has a wide 70° field of view combined with a long 20mm eye relief for eyeglass use . . .
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Pentax 20mm XW extra wide angle eyepiece

$299.00

5 Review(s)

This medium focal length Pentax provides sharp and very wide field images for both terrestrial and astronomical observing . . .
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Pentax 10mm XW extra wide angle eyepiece

$299.00

8 Review(s)

This short focal length Pentax is a high power eyepiece usable for both terrestrial and astronomical observing . . .
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Pentax 8-24mm SMC 1.25" long eye relief astronomical zoom; 21-63x or 26-78x spotting scope zoom

$359.00

This is an ultra-premium six-element zoom eyepiece with surprisingly good eye relief for those who must wear eyeglasses while observing. Designed for use with Pentax spotting scopes, it can also be used for astronomical observing in any telescope accepting 1.25" accessories . . .
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Pentax 5mm XW extra wide angle eyepiece

$299.00

7 Review(s)

This short focal length Pentax eyepiece has a very wide 70° field of view and very long 20mm eye relief, a uniquely useful combination not matched by other eyepieces . . .
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30mm XW extra wide angle 2" eyepiece

$369.00

This medium focal length 2" Pentax eyepiece is an excellent choice for medium power deep space observing with long focal length refractors, reflectors, or catadioptric scopes that have a 2" focuser or star . . .
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Pentax 14mm XW extra wide angle eyepiece

$299.00

2 Review(s)

This medium focal length Pentax is a dual-purpose eyepiece for both terrestrial and astronomical observing . . .
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Pentax 7mm XW extra wide angle eyepiece

$299.00

13 Review(s)

This wide field Pentax eyepiece is designed for high power observing of objects on the ground by day and in the skies at night . . .
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40mm XW extra wide angle 2" eyepiece

$399.00

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