Tele Vue 22mm Nagler Type 4 Eyepiece - 2
| Article number: | EN4-22.0 |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to us |
| 22-mm | |
| Model # | EN4-22.0 |
| Focal Length (mm) | 22 |
| Barrel Size (in.) | 2" |
| Apparent Field of View (deg.) | 82 |
| Eye Relief (mm) | 19 |
| Weight (lb / oz) | 1.50 / 24.0 |
| Field Stop (mm) | 31.1 |
| Compare to similar focal lengths | |
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Nagler Type-4 Eyepieces
Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, and longer eye-relief. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration.
For deep sky viewing, the comfort, clarity and contrast gets us closer to our "spacewalk" viewing goal.
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, 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).
Type-6 models have shorter focal lengths, are parfocal, with similiar 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" eyeguard are best for eyeglass wearers or Dioptrx users in their 22, 17, 12mm focal length range.