70° apparent field of view with 20mm eye relief. Waterproof for everyday use*, so you can use it without worrying about getting wet. / [XW7] XW7 70° apparent field of view with 20mm eye relief. Waterproof for everyday use*, so you can use it without worrying about getting wet. A 70° apparent field of view and 20mm eye relief deliver exceptional visibility and power. All products feature a 70° apparent field of view and 20mm eye relief. Enjoy powerful starry images with a wide field of view. New optical system for even higher performance. The optical system uses high-quality lanthanum-based high-refractive-index, low-dispersion glass. Advanced optical technology provides balanced correction of various aberrations. Particular attention is paid to spherical aberration in the pupil, reducing blackouts from the field of view for improved visibility. Unique multi-coating for superior transmittance. All lens surfaces that come into contact with the air employ PENTAX's unique multi-coating, and special coatings are applied to bonding surfaces, achieving transmittance of over 90% across the entire visible light spectrum (approximately 96% at 550nm). Advanced light-blocking technology, computer-simulated, positions the light-blocking aperture optimally. This delivers a higher-contrast field of view. A comprehensive lineup with a comprehensive, redesigned focal length for easy handling. From low-magnification stargazing to high-magnification planetary observation, this comprehensive lineup is perfect for any situation. Waterproof for everyday use* All products are waterproof for everyday use, ensuring peace of mind even if they get wet during observation. *JIS Class 4 equivalent, waterproof for everyday use. Not for underwater use. Sleeve size and eyecup mounting diameter are 31.7mm American size and 50.8mm 2-inch size. Removing the rotating eyecup reveals a 43mm diameter/P0.75 thread. Specifications: XW7, Focal Length: 7mm, Lens Construction: 6 Groups, 8 Elements, Apparent Field of View: 70°, Eye Relief: 20mm, Mounting Diameter: 31.7mm, Size (Maximum Diameter x Length): 61mm x 120mm, Weight: 390g, Manufacturer's Warranty: 1 Year