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Designed to enable a user to easily find the highest possible magnification on a given night with constantly changing atmospheric conditions, the Tele Vue Nagler Planetary 3-6mm Zoom Eyepiece is built with a 5-element/3-group lens configuration which allows it to achieve a relatively long 10mm eye relief despite its short focal lengths while being parfocal through the entire zoom range. Built to Tele Vue's exacting standards, the eyepiece features anti-reflection fully multi-coated optics to improve brightness, color rendition, and contrast; click-stop positions at every millimeter, a fold-down rubber eyecup, and a textured collar for sure handling in the cold or while wearing gloves.
The Planetary Zoom has a barrel diameter of 1.25" to fit into the most common sized focusers and accessories, and is also parfocal with all Tele Vue group 'B' eyepieces, allowing you to change compatible eyepieces without having to refocus every time - saving time and limiting vibrations. Parfocal group 'B' eyepieces include 8-32mm Plossls, all DeLites, 19 & 24mm Panoptic, 3.5-12mm Delos, and 1.25" Nagler Type-5 and 6's.