XW Series Eyepieces

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Clear, Comfortable Viewing Assured by 70° Apparent Angle of View and 20mm Eye Relief.

All smc PENTAX XW-series eyepieces feature an extra-wide 70-degree apparent angle of view and an extra-long 20mm eye relief to deliver an exciting, wide-perspective image.

High-Grade Optics for Exceptional Image Quality.

The high-performance XW-series optics incorporates high-refraction, extra-low-dispersion lanthanum glass elements to produce a well-balanced image with minimal aberrations. It is particularly designed to reduce the disturbing blackout effect by effectively compensating the spherical aberration of the pupil.

PENTAX-Original Multi-Layer Coating for Outstanding Light Transmission Efficiency.

All lens surfaces that come in contact with air are treated with the original multi-layer coating, while all laminated surfaces are treated with the innovative partial coating, to offer the light transmission efficiency of more than 90 percent (an astonishing 96 percent at 550nm) over the visible light spectrum.

Advanced Light-Shielding Technology for Improved Image Contrast.

Thanks to PENTAX’s advanced computer simulation technology, the XW series features a light-shielding diaphragm at the most effective position to drastically reduce internal reflections for a brighter, higher-contrast image.

A Choice of Six Magnifications to Meet Specific Applications.

With six different magnifications (3.5mm, 5mm, 7mm, 10mm, 14mm, 20mm and the new 30mm and 40mm) to choose from, the XW series accommodates a wide range of both casual and specialized applications.

Weatherproof Construction for All-Weather Viewing.

The XW series features JIS Class 4 weatherproof construction,* making it possible to use it in drizzle or under night dew.

* The XW-series eyepieces are not designed for underwater use and should not be submerged under water.

Standard Eyepiece Sleeve and Built-In Adapter-Mounting Screw

The XW series provides a choice of two installment diameters: American-standard 1.25″(31.7mm) version, and 2″ (50.8mm) version. When you remove the screw-on eyecup, the XW30-R and XW40-R models provide a screw thread with a 48mm diameter and a 0.75 pitch, while other models provide a screw thread with a 43mm diameter and a 0.75 pitch.



XW Eyepiece Specifications
Eyepiece LensXW3.5XW5XW7XW10XW14XW20XW30-RXW40-R
Lens Structure:8 elements8 elements8 elements7 element7 elements6 elements7 elements6 element
5 groups5 groups6 groups6 groups6 groups4 groups6 groups5 groups
Focal Length:3.5mm5mm7mm10mm14mm20mm30mm40mm
Apparent Field of View:70˚70˚70˚70˚70˚70˚70˚70˚
Eye Relief:20mm20mm20mm20mm20mm20mm20mm20mm
Attachment Diameter:1.25” (31.7mm)1.25” (31.7mm)1.25” (31.7mm)1.25” (31.7mm)1.25” (31.7mm)1.25” (31.7mm)2” (50.8mm)2” (50.8mm)
Filter Diameter:28.6mm28.6mm28.6mm28.6mm28.6mm28.6mm48mm48mm
Field Stop Diameter:4.3mm6.2mm8.8mm12.4mm17.6mm24.0mm36.2mm46.5mm
Eyepiece Ring:Helicoid typeHelicoid typeHelicoid typeHelicoid typeHelicoid typeHelicoid typeHelicoid typeHelicoid type
Height & Width:5.4”x2.4”5.0”x2.4”4.7”x2.4”4.3”x2.4”3.8”x2.4”3.4”2.4”4.8”x3.0”4.6”x3.0”
Weight:14.3 oz. (405g)14.0 oz. (395g)13.8oz. (390g)13.8 oz. (390g)12.9 oz. (365g)12.6 oz. (355g)26.1 oz. (740g)24.7 oz. (700g)


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