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Tele Vue 2" Nagler Type 4 Eyepiece - 17mm

5.0 (2 Reviews) Read Reviews Write Review
Brand TeleVue
Part Number EN4-17.0
Availability available

Product Info

Manufacturer Description

The Tele Vue 17mm Type 4 Nagler eyepiece provides excellent 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 users closer to Tele Vue's "spacewalk" viewing goal.

All Tele Vue Nagler eyepieces have proprietary tuned full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, rubber grip rings, cover for the eyeguard, an undercut in the barrel for extra locking security, and filter threads. All Tele Vue eyepiece lines are proprietary, in-house designs manufactured to their specifications and tolerances. Every eyepiece is individually tested at Tele Vue to ensure it meets high optical and cosmetic standards.

Take a "spacewalk" across a wide, sharp 82° apparent field
Compare a penny to a half dollar to see the relative size between a 50° and 82° apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes, Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges, anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1¼" models and rubber grip rings are additional Tele Vue "firsts". Even 2"/1¼" barrel models have an additional feature allowing the 2" extension tube (EBX-2120, sold separately) to be screwed on, which permits use of 2" filters as well as 1¼". 100% full field visual inspection on TeleVue's flat-field test instruments guarantees the performance of every Tele Vue eyepiece.

Concept: "You may know there's a long history of naming eyepieces after their designers: Kellner, Erfle and Plossl, to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today, I must admit a little discomfort when talking about "Nagler" eyepieces.

With "Naglers", my aim is to approach the wide angle perspective of naked eye vision, while maintaining the highest degree of sharpness, contrast, and viewing comfort. The goal is to allow the telescope to virtually "disappear," leaving the impact of "spacewalk" viewing." — Al Nagler

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, 12mmfocal length range.

Reviews

5.0 (Based on 2 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by Thomas F.
      1534734612
      Aug 19, 2018

      5.0 Wow

      Pros:

      Cons:

      Comments:

      It had better be good for the price, and it is. Can't wait for my next TV eyepiece from Agena.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

      Skill Level
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      User Notes:
      Review by Fede of Argentina.
      1380758400
      Oct 2, 2013

      5.0 Televue 17 mm 2" Nagler TV3

      Pros:

      Strong Construction

      Cons:

      Heavy

      Comments:

      Incredible Views! The best contrast in a High field. Ideal to use in 12" or more apertures. The images are like photos.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Apparent Field of View 82°
      Barrel Size 2" (50.8mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 65x120mm
      Coatings Fully Multi-Coated
      Max Width 2.4" (61.0mm)
      Eye Relief by Design 17mm
      Field Stop Diameter 24.3mm
      Filter Threads Standard 2" Filter Thread (M48 x 0.75)
      Focal Length 17mm
      Lens Elements 7
      Lens Groups 5
      Parfocal No
      Rubber Eye Guard Yes
      Blackened Lens Edges Yes
      Additional Information

      - Suitable for use with Tele Vue Dioptrx / digiscoping

      Manufacturer TeleVue
      Eyepiece Focal Length 15.1mm - 20mm
      Eyepiece Field of View Over 80 degrees
      Eyepiece Series Tele Vue Nagler
      Barrel Type With safety undercut
      Eyepiece Weight 25.60oz (725.75g)