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TeleVue Telescopes and Eyepieces and
82° Apparent Field Eyepieces
Model # EN5-16.0
Focal Length (mm) 16
Barrel Size (in.) 1¼"
Apparent Field of View (deg.) 82
Eye Relief (mm) 10
Weight (lb / oz) 0.44 / 7.1
Field Stop (mm) 22.1
The 16mm Nagler Type 5 is a scaled down version of
the "king of the field," 31mm. The Type-5 16mm is a smaller, lighter
(0.45 lbs.), 1¼" only, 6-element design which replaces the 8-element
16mm Nagler Type 2. This exciting little high contrast eyepiece looks
like a 19mm Panoptic, but packs the visual impact and sharpness we all
expect from the 82° Nagler series. This eyepiece offers owners of 1¼"
only scopes the largest possible true field in an 82° apparent field
eyepiece. Great for small scopes and Bino Vues.
Why Are There 3 Types of Naglers?
To achieve the full magnification range over 82° apparent field of view
requires two types: Nagler Type-5 with focal lengths of 31, 26, 20, 16mm
and Nagler Type-6 with focal lengths of 13, 11, 9, 7, 5, 3.5, 2.5mm.
The Type-5 permits the largest true field possible (31mm has 42mm field
stop), while the shorter focal length Type-6 models are parfocal, with
similar size and weight and all with a comfortable 12mm eye relief.
The Type-4 models feature about 18mm of eye relief and with the
"instajust" eye guard are best for eyeglass wearers or Dioptrx users in
their 22, 17, 12mm focal length range.