Pentax XW 20mm 70 Eyepiece

Pentax XW 20mm 70 Eyepiece

  (2 Reviews)
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About this product

Model:  PentaxXW20
Part Number:  70516

A premium quality low-medium magnification wide-field eyepiece. 


  • High-refraction, low-dispersion Lanthanum glass.

  • Pentax Super Multi-Coatings (SMC) on all air/glass surfaces.

  • Edge-blackened optics and optimised baffles minimise internal reflections.

  • Optically corrected for use with focal ratios as fast as f/4.

  • 20mm eye-relief and twist-up rubber-rimmed eyecups - perfect for spectacle wearers.

  • Chromed barrels threaded to accept filters.

  • Weatherproof to JIS Class 4 standards.

Lens Structure: 6 elements, 4 groups
Focal Length: 20mm
Apparent Field of View: 70 degrees
Eye Relief: 20mm
Attachment Diameter: 1.25" (31.7mm)
Filter Diameter: 28.6mm
Field Stop Diameter: 24.0mm
Eyepiece Ring: Helicoid type
Height & Width: 3.4" x 2.4"
Weight: 12.6 oz. (355g)

Eyepiece Field of View Simulator

Customer reviews

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Pentax Eyepiece review
04 January 2019  | 

As yet I have had only one chance to use the Pentax xw 20mm, this was with an Equinox 120 refractor. Views of the moon had wonderful contrast and crispness out to the edge of the field of view.
Extreemly comfortable eye piece to use, with a flat field and no visable false colour. The best eyepiece I have ever used, in fact I have just ordered the 14mm as well.
Cant wait for clear skys.

Rating (max 5):  
Fantastic eyepieces
27 July 2018  | 

I recently completed a whole set of Pentax XWs which I have been using for both dark sky and Solar observing and I must say I love them. The views are fabulous with great contrast and sharpness and the ergonomics of the design make these very easy to use and relatively light compared to similar quality eyepieces from other manufacturers. Great value.


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