Introducing Pentax Eyeieces!

Introducing Pentax Eyeieces!

We are happy to announce Mile High Astronomy is now a dealer for Pentax!

Pentax eyepieces have a strong reputation in the astronomy community. With a consistent 20mm eye relief, they are excellent for eyeglass wearers and are comfortable for just about anyone to use. The wide field of view of the XW eyepieces makes them ideal for a range of instruments including large dobs.

Clear, comfortable viewing assured by 85° or 70° apparent angle of view and 20mm eye relief

85-degree apparent angle of view eyepieces, XW23 and XW16.5 is newly added to the smc PENTAX XW-series line up featuring an extra -wide 70-degree apparanet angle of view with an extra-long 20mm eye relief to deliver an exciting wide-perspective image.

Long-focal-length eyepieces, ideal for nebula and star cluster observations

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

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 surface 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 (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.

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.

Sleeve size and eyecup design

The XW series provides as choice of two installment diameters: American-standard 31.7mm version, and 50.8mm (two-inch) version. When you remove the screw-on eyecup. it also provides a screw thread with a 43mm diameter and a 0.75 pitch.

Comprehensive lineup to accomodate all applications

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



XW23 XW16.5
Focal Length 23mm 16.5mm
Lens Construction
7/5 7/5
Apparent Angle of View 85° 85°
Eye Relief* 20mm (12mm) 20mm (12mm)
Sleeve Size 50.8mm 50.8mm
Length & Diameter [mm] 125 x 76 142 x 76
Weight [g] 770g 745g
Lens Construction Diagram XW23 XW16.5

XW40-R XW30-R XW20 XW14
Focal Length 40mm 30mm 20mm 14mm
Lens Construction
6/5 6/7 6/4 6/7
Apparent Angle of View 70° 70° 70° 70°
Eye Relief* 20mm (15mm) 20mm (15mm) 20mm (15mm) 20mm (15mm)
Sleeve Size 50.8mm 50.8mm 31.7mm 31.7mm
Length & Diameter [mm] 117 x 76 123 x 76 86 x 61 97 x 61
Weight [g] 700g 740g 335g 365g
Lens Construction Diagram XW40-R XW30-R XW20 XW14

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 (15mm) 20mm (15mm) 20mm (15mm) 20mm (15mm)
Sleeve Size 31.7mm 31.7mm 31.7mm 31.7mm
Length & Diameter [mm] 110 x 61 120 x 61 127 x 61 137 x 61
Weight [g] 390g 390g 395g 405g
Lens Construction Diagram XW10 XW7 XW5 XW3.5

* Figures in parentheses are the distance from the viewing rubber.

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