Pentax Eyepiece XW-16.5 16.5mm

High-performance wide angle eyepieces for ultra clear astronomical viewing - 85° Apparent Angle of View

The PENTAX XW series 85° Apparent Angle combined with 20mm of Eye Relief produces some the widest and most relaxed viewing possible with your telescope. 

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.

Sleeve Size and Eyecup Design

The XW series provides a choice of two diameter to suit practically all telescope fousers: American-standard 31.7mm version (1.25"), and 50.8mm (2") version.

 When you remove the screw-on eyecup, it also provides a screw thread with a 43mm diameter and a 0.75 pitch

Specifications