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TeleVue’s philosophy has long been one of pushing the state of the optical art to new heights with each new eyepiece design. The TeleVue Ethos eyepieces have raised the bar for the fundamental characteristics (the ethos) of all eyepieces, while expanding the apparent field of view to an incredible 100° for a truly immersive viewing experience. With the Ethos, you are no longer looking through an eyepiece, you are one with the universe.
The Ethos eyepieces have all the virtues that professional and amateur astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness – with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are individually tuned to the glass composition of each lens element.
A review in the October, 2007 Sky & Telescope magazine gave the original 13mm Ethos five stars, meaning “Sensibly perfect. No meaningful improvements possible.” The reviewer commented, “As revolutionary today as the original 13-mm Nagler eyepiece was when it was introduced in 1981, the 13-mm Ethos sets a new standard for wide-field observing. The on-axis performance is second to none, while the 100° apparent field is unprecedented for an astronomical eyepiece . . . if I were dropped on a desert island tomorrow with the 12-inch scope and only one eyepiece, I’d want it to be the Ethos.” The same comments could well be applied to all of the Ethos line, from the 3.7mm through the 21mm.