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
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.
Jun 10, 2019
The best view requires the best opticsPros: Cons: Comments:
Being the co-founder of our local astronomy club, I have access to a variety of eyepieces, so I do comparisons on a number of DSOs. Every time, the view through the Tele Vue eyepiece is brighter and showing better clarity. M13 is a favorite target and it looks as though diamonds of different brilliances were spilled out on black velvet. I am retired with a very low income. It takes me months to save up enough to buy one of these eye pieces, and I have never regretted it.
This review was provided courtesy of AgenaAstro.comSort by
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)