Nagler Planetary Zooms
Zoomable 50° Constant Apparent Field Eyepieces
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Excerpts from The Backyard Astronomer's Guide review of the 3-6mm Nagler Zoom.
- An exceptional zoom eyepiece is the 3mm-to-6mm Nagler Zoom, a specialized high-power eyepiece for dialing in the optimum power for planetary viewing with short-focal-length telescopes, such as fast apo refractors.
- Imaging is superb, and - a first - the apparent field stays constant throughout the zoom. Click stops define the 6mm, 5mm, 4mm and 3mm positions, through the observer can select any value in between. Its 10mm eye relief is a bit cramped for those who wear their eyeglasses while observing.
From Sky & Telescope's Hot Products review of the 3-6mm Nagler Zoom.
THERE HAVE BEEN ZOOM EYEPIECES IN THE PAST, BUT NONE QUITE LIKE THE Tele Vue 3mm-6mm Nagler Zoom ... . Since the time of Galileo, short-focal-length (hence high-magnification) eyepieces have been notoriously difficult to look through. That has changed in recent years, especially with the introduction of Tele Vue's line of Radian eyepieces (a 1999 Hot Product). The new Tele Vue zoom is small, lightweight, and offers the same magnifications (with click-stop settings) as four Radians while maintaining a constant focus and 50 degree apparent field. It also lets observers choose in-between focal lengths, thus giving them the ability to tune the magnification to atmospheric conditions, which is very critical for high-power viewing. Although the zoom's 10-millimeter eye relief isn't long enough for eyeglass wearers, it is enough to make this a very comfortable eyepiece to look through.— Sky & Telescope, (Editors). "Hot New Products of 2001: Zoom In". Sky & Telescope (Dec. 2001).
Excerpt from S&T's Hot Product review of the Nagler 2-4mm Zoom eyepiece.
Tele Vue's new 2-to 4-mm Nagler Zoom ... 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. It's the perfect companion for any of today's popular short-focus telescopes.— Sky & Telescope, (Editors). "Hot New Products for 2004: Magnification Extremes". Sky & Telescope (Jan. 2004). 34.