Released December 2019

The XW series, renowned for its use in astronomical telescopes.
70° apparent field of view, 20mm eye relief.
Waterproof for everyday use, even with night dew. / [XW40R] XW40R Released December 2019
Long focal length design ideal for observing nebulae and star clusters. The focal length design allows for panoramic views of celestial bodies (such as the Pleiades and Andromeda Galaxy) that stretch across the night sky. *When mounted on a 1000mm focal length astronomical telescope.
The 70° apparent field of view and 20mm eye relief provide outstanding visibility and clarity. The 70° apparent field of view and 20mm eye relief are standardized. Enjoy impressive starry images with a wide field of view.
High-performance optical system: High-quality lanthanum-based high-refractive-index, low-dispersion glass is used. Advanced optical technology provides balanced correction of various aberrations. Taking particular care to correct spherical aberration in the pupil, the lens reduces blackouts from the field of view, resulting in clearer viewing.
Superior transmittance thanks to unique multi-coating. PENTAX's unique multi-coating is used on all lens surfaces that come into contact with the air, and special coatings are applied to the bonded surfaces, achieving transmittance of over 90% across the entire visible light range (approximately 96% at 550nm).
Advanced light-blocking technology: Computer-simulated light-blocking aperture placement ensures optimal positioning, achieving a field of view with even higher contrast.
Comprehensive lineup: From low-magnification stargazing to high-magnification planetary observation, this comprehensive lineup is suited to any situation.
Water-resistant for everyday use: All products are water-resistant for everyday use, ensuring peace of mind even if they get wet during observation. *JIS Class 4 equivalent, splashproof. Cannot be used underwater.
Sleeve size and eyecup mounting diameter are 31.7mm American size and 50.8mm 2-inch size. When the rotating eyecup is removed, the XW40-R and XW-30R have a 48mm diameter/P0.75 thread, while all other models have a 43mm diameter/P0.75 thread. ■ Specifications ■

Focal length: 40mm Lens construction: 5 groups, 6 elements Eye relief: 20mm Apparent field of view: 70° Coating: Multi-coating Waterproof performance: JIS Class 4 equivalent Mounting diameter: 50.8mm Length x outer diameter: 117 x 76mm Weight: Approximately 700g □ Manufacturer's warranty period: 1 year