Eyepiece Smc Pentax Xw40-R

High-performance eyepieces for use with high-grade spotting scope smc PENTAX XW series - 70° or 85° Apparent Angle of View, 20mm Eye Relief, plus Weatherproof Body for Multi-Application Viewing Long-focal-length eyepieces, ideal for nebula and star cluster observations XW23 and XW16.5 are newly added to the smc PENTAX XW-series line up featuring an extra -wide 85-degree apparanet angle of view with an extra-long 20mm eye relief to deliver an exciting wide-perspective image. And thanks to their long-focal-length design, the XW40-R and XW30-R eye-pieces 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 10000mm. 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 under water. 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, it also provides a screw thread with a 43mm diameter and a 0.75 pitch. XW23 XW16,5 XW40 XW30 XW20 XW14 XW10 XW7 XW5 XW3.5