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William Optics 1.25" 66° Wide Angle Eyepiece - 20mm

5.0 (1 Reviews) Read Reviews Write Review
Brand William Optics
Part Number E-WA20

Product Info

Manufacturer Description

This is the well respected 20mm 66-deg wide angle eyepiece that William Optics has been including for many years with their binoviewers. Due to popular demand, they are now offering these eyepieces individually for sale as well. This eyepiece is perfect for binoviewer and mid-range power usage. The perfect compromise between quality, cost, eye-relief and edge sharpness.


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by 18 wheels and one telescope of Aurora Colorado and all over the West.
      Dec 31, 2015

      5.0 Great wide view





      A matched pair of these eyepieces was included with my W/O binoviewer. In the binoviewer or used as a straight eyepiece, these are excellent eyepieces, nice crisp view. The best part is the field of view. Up to this point I only had a nice little collection of Plossls. This is my first experience with a wider FOV eyepiece, and I was immediately hooked on the 'looking through a porthole into outer space' experience. Great value for the price.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Apparent Field of View 66°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 42x80mm
      Coatings Fully Multi-Coated
      End Caps 2
      Eye Relief by Design 20mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 20mm
      Lens Elements 4
      Lens Groups 3
      Rubber Eye Guard Yes
      Eyepiece Weight 3.10oz (87.88g)
      Blackened Lens Edges Yes
      Manufacturer William Optics
      Eyepiece Focal Length 15.1mm - 20mm
      Eyepiece Field of View 61 - 70 degrees
      Barrel Type Tapered barrel