The 15mm Explore Scientific 1.25" 52-deg Telescope eyepiece is a high-quality eyepiece designed for all telescope types. It features a generous eye relief, fully multicoated optics, and a 52 degrees field of view. Made with top-quality materials, this eyepiece is waterproof and has a removable flip-down style soft silicone rubber for added convenience. The eyepiece also includes a filter thread that fits standard 1.25-inch diameter threads in filters. With a focal length of 15mm, this eyepiece offers crisp and clear views for telescope enthusiasts.