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
About this product
Model: tv_ep_nagler_3.5mm
Part Number: EN6-03.5
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 three 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 eye-guards 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 a feature that enables the 2" extension tube (EBX-2120) to be screwed on, which permits the use of 2" filters as well as 1¼".
100% full-field visual inspection on Tele Vue's own flat-field test instruments guarantees the performance of every Tele Vue eyepiece.
EYEPIECE FEATURES
- Wide, sharp 82º apparent field of view
- Proprietary tuned full multi-coatings & high index glass
- Blackened lens edges & Anti-reflective threads
- Fold-down, rubber eyeguards & grip rings
- Threaded for either 1.25" or 2" filters depending on model
- Safety undercut in nosepiece barrel for extra locking security
- 100% full field visual inspection on Tele Vue's flat-field test instrument guarantees the performance of every Tele Vue eyepiece
- Supplied with eyeguard and nosepiece cover
Eyepiece Field of View Simulator
Why Are There 3 Types of Naglers?
Achieving the full magnification range over 82° apparent field of view requires two types: Nagler Type-5 with focal lengths of 31 and 16mm and Nagler Type-6 with focal lengths of 13, 11, 9, 7, 5, 3.5, 2.5mm.
Type-5 permits the largest true field possible (31mm has a 42mm field stop).
Type-6 models have shorter focal lengths, are parfocal, have similar size and weight, and have 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.
Nagler Type 4
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 correct eye distance and centration.
For deep sky viewing, the comfort, clarity and contrast gets us closer to our "spacewalk" viewing goal.
Nagler Type 5
With the 31mm, the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast Dobsonian/Newtonians can enjoy a larger true field, free of secondary shadowing, than ever before. For example, a 12.5", f/4.5 scope with a Paracorr will deliver a 1.5-degree field (3 Moon diameters) at 53x with a 6mm exit pupil. You can use our eyepiece calculator to determine what the 31mm will deliver on your scope.
The 16mm Nagler Type 5 is a scaled-down version of the "king of the field," 31mm. The Type-5 16mm is a smaller, lighter (0.45 lbs.), 1¼" only, a 6-element design which replaces the 8-element 16mm Nagler Type 2. This exciting little high-contrast eyepiece looks like a 19mm Panoptic but packs the visual impact and sharpness we expect from the 82° Nagler series. This eyepiece offers owners of 1¼" only scopes the largest possible true field in an 82° apparent field eyepiece. Great for small scopes and Bino Vues.
Nagler Type 6
The 7-element Nagler Type 6 design is based on the original patented Nagler design. This new 7-element design update for the short focal length Nagler deserves its own designation. Using different exotic materials, coating processes and design ingenuity, Al has massaged more eye-relief, contrast, and true field of view into the shorter focal length Naglers, while maintaining the absolute sharpness of the originals. Eye-relief is 12mm on each model, and all are around the same as the original 7mm! Weight about 0.4 to 0.5 lbs.
Concept: The goal we set when designing these new eyepieces was to increase contrast, maintain or increase eye-relief, reduce size and weight, and maintain the sharpness of the originals. They are all parfocal and great with the Bino Vue.
Specifications
| Model | 2.5mm | 3.5mm | 5mm | 7mm | 9mm | 11mm | 13mm | 16mm | 17mm | 22mm | 31mm |
|---|
| Focal Length (mm) | 2.5 | 3.5 | 5 | 7 | 9 | 11 | 13 | 16 | 17 | 22 | 31 |
| Barrel Size (in.) | 1¼" | 1¼" | 1¼" | 1¼" | 1¼" | 1¼" | 1¼" | 1¼" | 2" | 2" | 2" |
| Apparent Field of View (deg.) | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 |
| Eye Relief (mm) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 10 | 17 | 19 | 19 |
| Weight (lb / oz) | 0.54 / 8.7 | 0.53 / 8.5 | 0.49 / 7.9 | 0.50 / 8.0 | 0.42 / 6.7 | 0.42 / 6.7 | 0.40 / 6.4 | 0.44 / 7.1 | 1.60 / 25.6 | 1.50 / 24.0 | 2.20 / 35.2 |
| Field Stop (mm) | 3.4 | 4.8 | 7 | 9.7 | 12.4 | 14.9 | 17.6 | 22.1 | 24.3 | 31.1 | 42 |
Customer reviews
| Average Rating (2 Reviews): | |
31 July 2019 | Joseph
Of all the Naglers I've owned ..this IS the best in every way esp OPTICALLY ..SOO CLEAR..
ONLY one as good as Delites optically.. you can Barlow the he'll out of it and it's still giving!
09 April 2019 | David
Now then. This is a monster eyepiece! I got the 31mm and the size is incredible. In a large scope with a serious mount though it is very good indeed, The build quality is superb. The views of open clusters, M45 etc are stunning. Very good glass so edge to edge sharpness is great. Well recommended.
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