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Tele Vue Nagler 17mm Eyepiece

Tele Vue Nagler 17mm Eyepiece
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Price:  £349.00
List Price:  £400.00
(Inc. 20% VAT)
+

Product Code:  EN4-17.0
Manufacturer:  TeleVue
Eyepiece Type:  Ultra Wide
Field of View:  82 degrees
Barrel Size:  2" Eyepiece

TeleVue


Nagler 82°­ Apparent Field Eyepieces!

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, 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 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.

Specifications:

  • Model #  -  EN4-17.0
  • Focal Length (mm)  -  17
  • Barrel Size (in.)  -  2"
  • Apparent Field of View (deg.)  -  82
  • Eye Relief (mm)  -  17
  • Weight (lb / oz)  -  1.60 / 25.6
  • Field Stop (mm)  -  24.3

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