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
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.
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.
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.
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.
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.
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
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.