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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 ¼ diopter steps, from ¼ up to 2½
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 your
eyeglass prescription for astigmatism. All lenses are multi-coated
glass in anodized aluminum housings with rubber eyeguards.