You can now enhance your stargazing experience with the Dioptrx Astigmatism Correcting Lens - 0.50. This innovative product from Tele Vue, a brand synonymous with high-quality optical products, is designed to correct astigmatism, a common issue with eyepieces. Unlike your telescope's focuser, which compensates for near- or far-sightedness, the DIOPTRX lens specifically targets astigmatism. This durable and user-friendly accessory can be easily attached and locked onto the tops of over 20 long eye-relief Tele Vue eyepieces. This ensures the sharpest full-field viewing possible, enhancing your visual experience in astronomy.Available in 1/4 diopter steps, from 1/4 up to 3.5 diopters, these effective lenses are rotatable, allowing you to tune to the best orientation. The barrel features a series of engraved letters to help monitor the orientation. Simply select the DIOPTRX model that matches your eyeglass prescription for astigmatism.Each lens is made from multi-coated glass housed in anodized aluminum, complete with rubber eyeguards. This astigmatism correcting lens accessory is designed to maximize your visual performance by matching your eyesight to the eyepiece. The DIOPTRX lenses are compatible with all long eye-relief Tele Vue eyepieces recommended for digiscoping. This includes the 31mm Nagler type 5, 26mm Nagler type 5, 35mm Panoptic, 27mm Panoptic, 22mm Panoptic, 55mm Plossl, 40mm Plossl, 32mm Plossl, all Radians (18mm thru 3mm), all Nagl