Tele Vue 17mm Nagler Type 4 Eyepiece - 2"

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Tele Vue 17mm Nagler Type 4 Eyepiece - 2"
Item # TE-EN4-17.0
  • The Tele Vue 17mm Nagler Type 4 eyepiece is a 6-element design with more true field, better imaging and contrast enhancement.
  • This Nagler has a 2" barrel with an 82 apparent field of view and 17mm of eye relief.
  • The Tele Vue 17mm Nagler Type 4 has blackened lens edges, anti-reflection threads and rubber eyeguards deliver maximum contrast.
  • 100% full field visual inspection with Tele Vue flat-field test instruments guarantees performance.


Televue Nagler Type 4 Eyepieces: Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements to achieve focal lengths of 12mm, 17mm and 22mm. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. When TeleVue designed the Radian series of eyepieces, they used the Nagler concept as the basis. However with the Radians, the decided to balance size, weight, and cost relative to a consistent 20mm eye relief. During the design process they found they could not only balance these factors for 1.25" focusers, but new glass types lead to better imaging, contrast enhancement, reduced pincushion, ghost suppression, and a new concept in a click-stop adjustable eyeguard as well.

Applying that experience to the 82 degree, Nagler Type 2 design goals would potentially provide increased eye-relief, more contrast, reduced pincushion, and more true field as well. The first Nagler Type 4 to arrive is the 12mm version, replacing not only the 12mm Nagler Type 2 but its predecessor 13mm (the first Nagler) and the 11mm, now considered a collector item. Users confirm that for deep sky viewing, the comfort, clarity and contrast of the 12mm Type 4 gets Tele Vue closer to their "spacewalk" viewing goal. Similar in size and weight to Type 2, it has more true field and 50% greater eye relief, while using just six elements.
Additional Information

Additional Information

SKU TE-EN4-17.0
Manufacturer Tele Vue
Optical Design Nagler
Barrel Size 2"
Warranty Lifetime Warranty
Eyepiece Field of View - Apparent 82º
Eyepiece Focal Length 17mm
Eyepiece Eye Relief 17mm
Eyepiece Manufacturer Series Televue Nagler
Eyepiece Weight 1 lb. 9.6 oz.
Field Stop 24.3mm
Number of Lens Elements & Groups 6 element
Special Feature None
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes

Customer Reviews 1 item(s)

Fantastic view
Love at first sight... One will be impressed with manufacturing quality after feeling the eyepiece in his hands. Being not carefuly reviewed because of the unfavorable weather conditions, observing some pin point stars with a large field of view, impressed me much. It is highly recomemnded to have this baby in your eyepiece collection.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Mahmut YILMAZ / (Posted on 1/30/2011)
Included Items

Included Items

  • Televue 17mm Nagler Type 4 Eyepiece
  • Dust Caps
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