The Meade 07740 Series 5000 5.5-Millimeter Xtreme Wide Angle Eyepiece has an extremely large 82-degree apparent field of view, 7-element, multi-coated lenses with blackened edges and rotating adjustable twist up eyecups. This item features sharp optimal performance with low chromatic aberration, as well as comfortable 13.2-millimeter eye relief. This eyepiece is threaded to work with Meade’s 1.25-inch astronomy filters and is waterproof. Parfocal like other Series 5000 eyepieces, this item requires little focus adjustment when switching between eyepieces. The Meade 07740 Series 5000 5.5-Millimeter Xtreme Wide Angle Eyepiece comes with a 1-year 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.