Pentax SMC XW20 20mm Wide Angle Eyepiece (1.25")

Pentax SMC XW20 20mm Wide Angle Eyepiece (1.25")

Pentax SMC XW20 20mm Wide Angle Eyepiece (1.25")

B&H # PEEP20X MFR # 70516
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Value: $9.99

Product Highlights

  • Fits 1.25" Pentax Spotting Scopes
  • 32x with PF-100ED Spotting Scope
  • 27x with PF-80EDA Spotting Scope
  • 26x with PF-80ED Spotting Scope
  • 19.5x with PF-65EDA II & PF-65ED II
  • 70° Apparent Angle of View
  • Extra-Low Dispersion Lanthanum Glass
  • Fully Multi-Coated
  • 20mm Eye Relief
  • Waterproof & Fogproof
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Price:  $356.00

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Pentax 70516 overview

  • 1Description

Featuring premium optical components, a wide 70° field of a view, and generous 20mm eye relief for comfortable glassing, the SMC XW20 20mm Wide Angle Eyepiece is designed for use with Pentax 65mm, 80mm and 100mm spotting scopes. This 20mm focal length eyepiece yields 32x magnification with the PF-100ED, 27x with the PF-80EDA, 26x with the PF-80ED, and 19.5x with the PF-65EDA II and PF-65ED II. Extra-low dispersion lanthanum glass elements provide a balanced image with minimal aberrations, while fully multi-coated air-to-glass surfaces and partially coated laminated surfaces avoid reflection for optimal light transmission. A light-shielding diaphragm further reduces internal reflections for a bright, high-contrast image.

The eyepiece is constructed to Japanese Industrial Standard Class 4 for water resistance. It is not to be used underwater, but will easily withstand light rain or dew. Its diameter is the American standard of 1.25", so it can be used in other spotting scopes or telescopes, and it offers a 43mm adapter mounting thread under the removable eyecup.

  • Pentax PF-100ED, PF-80EDA, PF-80ED, PF-65EDA II, PF-65ED II spotting scopes
Optical Performance
  • Wide 70° field of view
  • Long 20mm eye relief accommodates eyewear
  • 32x magnification with PF-100ED
  • 27x magnification with PF-80EDA
  • 26x magnification with PF-80ED
  • 19.5x magnification with PF-65EDA II and PF-65ED II
  • Extra-low dispersion lanthanum glass
  • Fully multi-coated on surfaces that come into contact with air
  • Partially coated laminated surfaces
  • Light-shielding diaphragm further reduces internal reflection
  • Weatherproof construction (JIS Class 4-rated)
  • 1.25" diameter
  • 43mm adapter thread under eyecup
UPC: 027075075245
In the Box
Pentax SMC XW20 20mm Wide Angle Eyepiece (1.25")
  • Limited 25-Year Warranty
  • Table of Contents
    • 1Description

    Pentax 70516 specs

    Magnification With PF-100ED: 32x
    With PF-80EDA: 27x
    With PF-80ED: 26x
    With PF-65EDA II and PF-65ED II: 19.5x
    Angle of View Apparent: 70°
    Field of View With PF-100ED: 124' / 38 m at 1000 m
    With PF-80EDA: 135' / 45 m at 1000 m
    With PF-80ED: 141' / 47 m at 1000 m
    With PF-65EDA II and PF-65ED II: 186' / 61 m at 1000 m
    Eye Relief 20 mm
    Weatherproofing JIS Class 4-rated weather-resistant
    Dimensions 3.4 x 2.4" / 8.6 x 6.1 cm
    Weight 12.5 oz / 355 g
    Packaging Infoefuqvyfetvwcfdbsvves
    Package Weight 1.15 lb
    Box Dimensions (LxWxH) 7.5 x 4.1 x 3.4"

    Pentax 70516 reviews

    SMC XW20 20mm Wide Angle Eyepiece (1.25") is rated 4.8 out of 5 by 6.
    Rated 5 out of 5 by from Superlative Eyepiece This is la creme de la creme of all Pentax xw eyepieces. My review is based on terrestial observation with a Pentax PF 80 ED scope. I have all four eyepieces 20-14-10-7. I bought this one last (Stupid!) and I can assure you it definitely surpasses the other ones by a long shot, the 14 comes second followed by the 10 and the 7 with less honors pushing the scope to the limit in magnification for practical uses. Buy the 20 first followed by the 14. The 10 is pretty good, the 7 the lacks the brightness of the others and is unusable when the slightest weather turbulance is present but nice to have for those picture perfect clear days.
    Date published: 2010-12-21
    Rated 5 out of 5 by from Pentax Rules! This is a great all around eyepiece! Sharp images and high quality with a great warranty. I tried it in my spotting scope during the day for bird watching and it gave me a great widefield image. Forget the zooms especially in hot climates you will get too much mirage, this is the eyepiece to use for nature lovers everywhere! At night it doubles as a superb widefield astronomy eyepiece that will give you detailed images of nebulas, star clusters, and galaxies. Put a barlow on it and you have a great planetary eyepiece for high magnification. If you only have room for one eyepiece this is the one to get. And B&H shipped fast and was very reasonable. This eyepiece uses a standard size for many spotting scopes and telescopes which gives it versatility. The long eye relief is great for eyeglass wearers and it is very comfortable to use in long viewing sessions.
    Date published: 2014-09-03
    Rated 5 out of 5 by from An exceptional eyepiece Took my recently acquired Pentax SMC XW 20mm eyepiece out for its first light recently with my 6-inch SCT. Conditions were not ideal as the skies were not particularly transparent due to smoke and passing clouds from a combination of monsoon flow and western US wildfires. Still, this eyepiece was a noticeable step up compared to the 25mm Plossl I had been using. During moments of good viewing, stars and planets were bright and sharp with no noticeable color aberration. The wide field of view and generous eye relief were especially nice. The only negative is some slight field curvature in the outer third of the field of view even though my SCT has a focal ratio of f10. With faster telescopes, the field curvature may be more of a concern. But again the 70 degree field of view is so much more expansive than my Plossl eyepieces that when a planet or DSO was centered, this was quickly forgotten.
    Date published: 2018-09-03
    Rated 4 out of 5 by from Decent match for pf 80ed spotting scope A decent all round match with the 80mm pentax spotting scope but if higher magnification is needed to see small things like leg band colors on birds a higher magnification would be recommended.
    Date published: 2011-06-10
    Rated 5 out of 5 by from great all around eyepiece I bought this scope and the 20mm eyepiece for target shooting. It offers excellent optics, great field of view, and long eye relief. It is the perfect eyepiece for this scope, exceptional glass.
    Date published: 2013-05-19
    Rated 5 out of 5 by from Just right I use this eyepiece on my LB-12 telescope.
    Date published: 2015-06-23
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