Pentatsux Epi-s XW-20 Astronomical Telescope Eyepiece 70556

The XW series has been renowned for astronomical telescopes. The wide-angle apparent field of view of 70° and 0.8 inch (20 mm) eye relief achieves outstanding strength and ease of view. With a 70° apparent field of view, eye relief unified to 0.8 inches (20 mm), you can enjoy powerful star images with a wide viewing angle. Optical system for high performance The optical system adopts high grade lantern-type high-refractive index dispersion glass. High optical technology balanced aberrations Especially considering the spherical aberration of the pupil, reducing the blackout of the field of view for better visibility. Unique multi-coating for superior transmittance Pentax's proprietary multi-coating applies to all lens air contacts The bonding surface is also applied with a special coating to achieve a transmission rate of more than 90% (about 96% at 500 nm). Advanced Blackout Technology Computer simulates light filtering apertures in place for enhanced contrast viewing. Waterproof for everyday use. All products are waterproof for everyday use, so you can rest assured even if it gets wet at night dew when observing

• A 70° and 0.8 inch (20 mm) long eye relief design for a wide field of view and ease of view
• All products are waterproof for everyday use, so you can rest assured even if it gets wet at night dew when observing
• Unique multi-coating for superior transmittance on all lens surfaces
• Advanced blackout technology provides high contrast viewing
• Mounting diameter is 1.2 inches (31.7 mm). American size