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Pentax smc XW30-R 30mm 2-inch Eyepiece

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in In stock (2)
1.15 kg
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including VAT 20.00 % ( £56.33 )


Pentax XW Eyepiece Revived!

Due to high demand and public interest, the famous 30 and 40mm XW eyepieces are back!


- All Pentax XW series eyepieces may be used with astronomical telescopes with appropriate 1.25" or 2” focusers (depending on the specification of each eyepiece).
- XW 3.5mm, 5mm, 7mm, 10mm, 14mm, 20mm, 30mm, and 40mm provide a wider field of view than previous PENTAX eyepieces
- Improved 70 degree field of view for wider views
- XW 3.5mm, 5mm, 7mm, 10mm, 14mm, 20mm eyepieces may be used with our PF series Spotting Scopes (except PF 63 Zoom) (XW 30 and XW 40 eyepieces are not compatible with PF Spotting Scopes)
- Fully multi-coated lenses increase light transmission and contrast
- High refraction, extra-low dispersion lanthanum glass elements deliver bright, high resolution images with minimal distortions and aberrations
- Weatherproof construction for greater durability (JIS Class 4 weatherproof construction, but not designed for underwater use and should not be submerged)
- Long eye relief (20mm) for comfortable viewing with or without glasses
- Advanced computer simulation design technology implemented to drastically reduce internal reflections, producing brighter, clearer images


Long-Focal-Length Eyepieces, Ideal for Nebula and Star Cluster Observations

Thanks to their long-focal-length design, the new XW30-R and XW40-R eyepieces will let you observe large celestial bodies spreading across the night sky, such as the Pleiades star cluster and the Andromeda Galaxy, in their entirety. *
* When mounted on an astronomical telescope with a focal length of 1000mm.

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.

Comprehensive Lineup to Accommodate All Applications

Featuring functional, practical focal lengths, the XW eyepiece series provides a comprehensive lineup that accommodates all types of applications, from low-magnification viewing of stars to high-magnification observation of planets.

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

Sleeve Size and Eyecup Design

The XW series provides a choice of two installment diameters: American-standard 31.7mm version, and 50.8mm (two-inch) 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.

Model: XW40-R
Focal Length: 40mm 30mm 20mm 14mm
Lens Construction
6/5 7/6 6/4 7/6
Apparent Angle of View: 70° 70° 70° 70°
Eye Relief: 20mm 20mm 20mm 20mm
Sleeve Size: 50.8mm 50.8mm 31.7mm 31.7mm
Length & Diameter [mm]: 117×76 123×76 86×61 97×61
Weight [g]: 700g 740g 355g 365g


Model: XW10 XW7 XW5 XW3.5
Focal Length: 10mm 7mm 5mm 3.5mm
Lens Construction
7/6 8/6 8/5 8/5
Apparent Angle of View: 70° 70° 70° 70°
Eye Relief: 20mm 20mm 20mm 20mm
Sleeve Size: 31.7mm 31.7mm 31.7mm 31.7mm
Length & Diameter [mm]: 110×61 120×61 127×61 137×61
Weight [g]: 390g 390g 395g 405g

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