While your telescope's focuser adjusts for near- or far-sightedness, the DIOPTRX Astigmatism Correcting Lens - 1.50 is designed to compensate for astigmatism, enhancing your visual experience. This innovative lens accessory securely attaches to over 20 long eye-relief Tele Vue eyepieces, enabling the sharpest full-field viewing possible. Available in 1/4 diopter increments, ranging from 1/4 to 3.5 diopters, the DIOPTRX models are rotatable, allowing for fine-tuning to the optimal orientation. The barrel features a series of engraved letters to assist in monitoring the orientation. Simply select the DIOPTRX model that aligns with your eyeglass prescription for astigmatism. Each lens is crafted from multi-coated glass housed in anodized aluminum with rubber eyeguards, ensuring durability and high-quality performance. Tele Vue, a trusted name in the field of astronomy, has developed this astigmatism corrector to overcome the limitations of eyesight, enhancing the visual experience for astigmatism sufferers. The DIOPTRX Astigmatism Correcting Lens - 1.50 is designed to maximize visual performance by matching your eyesight to your eyepiece. It fits directly onto all long eye-relief Tele Vue eyepieces, including those recommended for digiscoping due to their long eye relief. 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 through 3mm), all Nagler t