Eyepiece PENTAX XW 16.5 mm

Long focal length eyepieces, ideal for observations of nebulae and star clusters

Thanks to their long focal length design, the XW40-R and XW30-R eyepieces will allow you to fully observe large celestial bodies stretching across the night sky, such as the Pleiades star cluster and the Andromeda galaxy.

* When mounted on an astronomical telescope with a focal length of 1000mm.

High-end optics for exceptional image quality

The high-performance optics of the XW series incorporate high-refractive, extra-low dispersion lanthanum glass elements to produce a balanced image with minimal aberrations. It is specially designed to reduce the annoying blackout effect by effectively compensating for spherical aberration of the pupil.

PENTAX original multi-layer coating for outstanding light transmission efficiency.

The entire lens surface that comes in contact with the air is treated with the original multilayer coating, while all laminated surfaces are treated with the innovative partial coating. to deliver light transmission efficiency exceeding 90 percent (96 percent at 550 nm) in the visible light spectrum.

Advanced light-shielding technology for improved image contrast

Thanks to PENTAX's advanced computer simulation technology, the XW series incorporates a light-shielding diaphragm in the most effective position to dramatically reduce internal reflections for a brighter, higher-contrast image.

Weather-resistant construction

The XW series features JIS Class 4 weatherproof construction.

Technical Features

Focal length: 16.5mm

Lens construction [Elementos/Grupos]: 7/5

85°apparent angle of view

Eye relief: 20mm (12mm)

Barrel diameter: 50,8mm

Length and Diameter [mm]: 142 x 76

Weight [g]: 745g

The figure in parentheses corresponds to the distance of the viewing rubber.