Pentax SMC XW 20mm Eyepiece (1.25")

BH #PEEP20X • MFR #70516
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Pentax SMC XW 20mm Eyepiece (1.25")
Key Features
  • For Select Pentax Spotting Scopes
  • For Telescopes That Use 1.25" Eyepieces
  • Wide 70° Angle of View
  • Low-Dispersion Lanthanum Glass Lenses
Compatible with their PF-65 and PF-65 ED II series, PF-80 series, and PF-100 series spotting scopes plus just about any telescope that accepts 1.25" eyepieces, the Pentax SMC XW 20mm Eyepiece produces a low magnification that provides a wide field of view, whether you use it for astronomical or terrestrial subjects.
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Pentax 70516 Overview

Compatible with their PF-65 and PF-65 ED II series, PF-80 series, and PF-100 series spotting scopes plus just about any telescope that accepts 1.25" eyepieces, the Pentax SMC XW 20mm Eyepiece produces a low magnification that provides a wide field of view, whether you use it for astronomical or terrestrial subjects.

Using low-dispersion lanthanum glass with a six elements in four groups lens configuration and antireflection multicoatings, views through the eyepiece are crisp and bright with high resolution and minimal distortion. The spacious 70° field of view and exceptional 20mm eye relief ensure maximum comfort for long-duration use.

UPC: 027075075245

Pentax 70516 Specs

Focal Length
20mm
Apparent Field of View
70°
Eye Relief
20.0 mm
Barrel Diameter
1.25"
Field Stop Diameter
24 mm
Dimensions
ø: 2.4 x L: 3.4" / ø: 6.1 x L: 8.64 cm
Weight
12.88 oz / 365 g
Packaging Info
Package Weight
1.17 lb
Box Dimensions (LxWxH)
7.4 x 3.95 x 3.5"

Pentax 70516 Reviews

Great Eyepieces on sale too

By Scott
Rated 5 out of 5
Date: 2026-02-18

I bought the 5mm, 10mm and 20mm for my 115mm Refractor. These have great eye relief for an old guy like me. The set will last me forever :)

Clear and bright

By Tomas
Rated 5 out of 5
Date: 2020-09-04

I use this eyepiece mostly for birding. Unlike eyepieces with a zoom, this eyepiece provides clear and bright looks at the birds with a wide field of vision. I had been using a 14 mm lens on my Pentax spotting scope, but have found that this is a nice upgrade in terms of reach.

See any errors on this page?

question

i have a range of spotting scopes and have just bought a televue 85 scope i want to see the birds clearly that my 82 leica 65 leica and 65 vanguard can't at long range so this eyepiece only gives me the same as them am i correct in that ?
Asked by: Anonymous
The will have the same issue at long range: that any scope has trouble looking sideways through atmospheric turbulence beyond 40-60x. So....you are correct there. Laminar flow over smooth surfaces helps: I can see seabirds a mile away over the ocean. There may be times of day and weather when you can see better. Looking up (astronomy) has much less disturbance..
Answered by: james
Date published: 2021-11-23

I have a Pentax 65 ED II spotting scope and ...

I have a Pentax 65 ED II spotting scope and Pentax SMC XW 10mm eyepiece. If I wanted a greater field of view, should I get a bigger eyepiece 20mm or smaller one 5mm?
Asked by: Leonard
Magnification in telescopes and spotting scopes is calculated by division. So a 20mm eyepiece will have a greater angle of view than a 10mm or 5mm.
Answered by: John
Date published: 2022-11-02

question

is this eyepiece good for long range birdwatching?
Asked by: Anonymous
You will want more power (ie, lower focal length eyepiece) and calm weather (horizontal viewing can be turbulent at long range). 60x at 150 yds is only a little wavy,,,,,60x at 1 mile can get messy.
Answered by: james
Date published: 2021-11-23
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