Eye Relief and Comfort All Explore Scientific eyepieces are designed to incorporate long eye relief. Soft fold down eyecups make these eyepieces comfortable even when wearing eyeglasses. High contrast, brilliant detail 100˚ Series™ Waterproof Eyepieces* Hyper-Wide Apparent Field of View Optics and Coatings The Explore Scientific 100° Series™ waterproof hyper-wide-field eyepieces are optimized to produce high-contrast, well-corrected views using high-refractive glass with durable multilayer coatings. The 100° Series™ offers observers a hyper-wide apparent field of view that opens up vast expanses of inky black sky for a fully immersive experience. Ask about Gas Purged Each eyepiece is sealed and purged with an inert gas to create a dust-free, waterproof environment that protects the optics for a lifetime of use. ou r Explore STAR Lifetime Warranty All Explore Scientific eyepieces registered within 60 days of purchase are protected by our exclusive, fully-transferrable lifetime warranty to guarantee your satisfaction. What will you discover? explorescientificusa.com - 866.252.3811 ©2015 Explore Scientific All rights reserved. *Register within 60 days for our No-Fault Lifetime Transferable Warranty. Check out our Dealers page for a nearest location.http://www.explorescientificusa.com http://www.explorescientificusa.com