Pentax XW Series 2" Wide Angle Eyepiece - 40 mm Focal Length, 70° Field

The Pentax XW40-R 40 mm Wide-Angle Eyepiece is engineered to deliver a relatively low magnification, with a wide field of view and a long eye relief - making it ideal for taking in wide swaths of the night sky for deep-space visual exploration.

Its long eye relief makes it extremely comfortable during long observation sessions while offering you the ability to utilize the averted vision techniques that allow you to see faint details of elusive objects like wispy nebulae and galaxies. Viewing comfort is also optimized for eyeglass wearers.

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, even when attached to an astronomical telescope with a focal length of 1000 mm.

Clear, comfortable viewing assured by 70° apparent angle of view and 20 mm eye relief
All SMC Pentax XW-series eyepieces feature an extra-wide 70-degree apparent angle of view and an extra-long 20 mm eye relief to deliver an exciting, wide-perspective image. Also features an adjustable twist-up eye cup.

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 original multi-layer coatings, while all laminated surfaces are treated with an innovative partial coating to offer the light transmission efficiency of more than 90 percent (an astonishing 96 percent at 550 nm) 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. However, please note that the XW-series eyepieces are not designed for underwater use and should not be submerged under water.

Standard eyepiece barrel size and built-In adapter-mounting thread
The XW series provides a choice of two installment diameters: standard 31.7 mm (1.25") version, and 50.8 mm (2") version. When you remove the screw-on eyecup, eyepieces provide a screw thread with 43 mm diameter and 0.75 pitch.

Scope of Delivery

• Pentax XW40-R 40 mm 2" Eyepiece
• Eyepiece Case
• Bottom Dust Cap
• Lens Cap