The Meade 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter uses multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images. This slip fit 2-inch diagonal with 1.25-inch adapter, plus the Schmidt Cassegrain thread to 2-inch accessory adapter (for LS, LT, LX90, LX200 and other Schmidt Cassegrain rear thread screw-on systems), is compatible with both slip-fit and screw-on mounting systems. This item’s non-marring compression safety secures the eyepieces. The optics are made with Pyrex glass and comes with dielectric coatings for the most light transmission possible. This item has been interferometer-tested for excellent performance. The Meade 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter comes with a full 1-year Meade factory limited warranty. Meade has everything you need to capture the night sky for experienced star-shooters, serious researchers and beginners alike. Serious astronomers for years have flocked to Meade telescopes for their quality optical systems and patented technology. Consumers know that "Meade Optics Inside" means that what they see through our telescopes will be views that are detailed, crisp and full of contrast. Look through a Meade this evening and see what you"ve been missing.