Your telescope's focuser is used to compensate for your near- or far-sightedness; DIOPTRX compensates for your astigmatism. These units attach and lock onto the tops of over 20 long eye-relief Tele Vue eyepieces to achieve the sharpest full-field viewing possible. DIOPTRX models are available in 1/4 diopter steps from 1/4 up to 2 and 1/2 diopters and are rotatable for tuning to the best orientation. A series of engraved letters on the barrel helps to monitor orientation. Simply choose the DIOPTRX model that matches their eyeglass prescription for astigmatism. All lenses are multi-coated glass in anodized aluminum housings with rubber eyeguards. Long Eye-Relief Tele Vue Eyepieces that Accept DIOPTRXTeleVue Pl?ssl 55 40 32mmTeleVue Radian 18 14 12 10 8 6 5 4 3mm TeleVue Panoptic 41 35 27 22mm Nagler Type 4 22 17 12mm Nagler Type 5 31 26mm
