Tele Vue 21mm Ethos Eyepiece - 2"

Maximize your "spacewalk" experience with the Tele Vue 21 mm Ethos Eyepiece with a 2" barrel. Transform your passage through the Milky Way with the 21mm's nexus of contrast, power and field. Larger deep sky objects and rich star fields are its natural playground. Looking on-axis your field-of-vision is filled with 100 degrees of stars, however wherever you chose to concentrate your attention you'll see sharpness and richer contrast. The optical performance of the 21mm is the work of Ethos lead designer Paul Dellachaiae, who achieved a level of optical aberration correction right in line with his other Ethos designs. Contrast and transmission have been maximized using the same advanced coating techniques and further aided by the internal mechanical design techniques used in all Tele Vue eyepieces. Extending the Ethos focal length range to 21mm while maintaining the original performance goals of the rest of the series brings the eyepiece up against the mechanical limits of the 2" barrel