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Press release from Tele Vue:
Concept
The Nagler Type 7 series was developed as a natural extension of our highly regarded, 85°,
limited edition Apollo 11 eyepiece. However, the series can also be thought of as an
extension of the long eye relief Nagler Type 4 concept. With the all-new Type 7 design
layout, we achieved our goal of Apollo 11-like performance across a series of focal lengths
that are eyeglass friendly.
Design Goals
The design goal was simple. The performance of each of the Type 7 focal lengths must equal or exceed that of the Apollo 11 eyepiece in the areas of full-field sharpness, contrast,
distortion correction, eye relief, and pupil comfort, but across an 82° apparent field of view instead of 85°.
If you have been waiting for a Nagler series for eyeglass wearers, the Type 7 is it. Combining the expansive 82° apparent field of view with 19 mm of eyeglass friendly eye relief, and large eyelens, the Nagler Type 7s give a new dimension to the “spacewalk” viewing effect. An easily adjustable, locking eye-guard is included for those who don’t wear eyeglasses. It helps to correctly position your eye to the exit pupil so you don’t get too close to the eyelens, as well as blocks contrast-robbing stray light from interfering with the view. Speaking of which, of course we’ve applied all the optical coating and baffling features Tele Vue eyepieces are known for to maximize contrast and compliment the fully corrected field; revealing beautifully natural star colors with pinpoint sharpness. The optical layout affords unrivalled parfocality throughout the four focal lengths and even between 1¼” and 2” modes when used with the Tele Vue Hi-Hat 1¼” to 2” adapter (ASF- 8125). The Type 7 series is also parfocal with all other 1¼” Tele Vue eyepieces (except 40 mm Plössl) when those eyepieces are used in the Tele Vue Hi-Hat 1¼” to 2” adapter (ASF-8125). Available in focal lengths of 5.5, 9, 14, and 19-mm, the Type 7s complement the 22-mm Type 4 and 31-mm Type 5 as eyeglass friendly Naglers.
Specifications
Focal Length: 5.5mm
Barrel Size: 2" & 1.25"
Apparent FOV: 82 deg
Tele Vue Parfocal Group: B (in 2" mode)
Eye Relief: 19mm
Weight: 587g
Use with Binoviewer: Yes
Dioptrx Compatible: Yes
FoneMate Compatible: Yes