Pentax SMC XO Eyepieces

Designed with astrophotographers and professional astronomers in mind, the Pentax SMC XO Eyepieces are ideal for high-magnification observation and photography of celestial bodies and phenomena. Available in your choice of 2.5mm and 5mm options, these eyepieces have been engineered using advanced computer simulation design technology. Features include SMC full-surface multi-layer lens coating to improve the transmission and clarity of light, high-refraction lanthanum glass elements to minimize aberrations, JIS Class 4 weather-proof construction for versatility, 44-degree apparent field of view, 2.5 or 5.1mm focal length, 3.6mm or 3.9mm eye relief, 3.9mm field stop diameter, and 28.6mm filter diameter. Each eyepiece weighs 4.2 ounces (2.5mm) or 4.9 ounces (5mm). Enjoy enhanced clarity with the help of these professional-grade eyepieces, backed by a limited lifetime warranty from Pentax.