Tele Vue's 3mm-to-6mm Nagler Zoom is an exceptional zoom eyepiece , a specialized high-power eyepiece for dialing in the optimum power for planetary viewing with short-focal-length telescopes, such as fast apo refractors. It features click stops at half-millimeter intervals of focal length, a constant 50° apparent field of view, and an eye relief of 10 mm -- not sufficient for eyeglass wearers, but remarkably comfortable for an eyepiece of such short focal length
| Model # | ENZ-0306 |
| Focal Length (mm) | 6 - 3 |
| Barrel Size (in.) | 1¼" |
| Apparent Field of View (deg.) | 50 |
| Eye Relief (mm) | 10 |
| Weight (lb / oz) | 0.33 / 5.3 |
| Field Stop (mm) | 5.1 - 2.6 |