12mm Nagler Type 4 Eyepiece 1-1/4 and 2 Inch -
Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements to achieve focal lengths of 12mm, 17mm and 22mm. With added eye-relief, the click
EN4-12 - TeleVue -