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.

• Model # EN5-31.0
• Focal Length (mm) 31
• Barrel Size (in.) 2"
• Apparent Field of View (deg.) 82
• Eye Relief (mm) 19
• Weight (lb / oz) 2.20 / 35.2
• Field Stop (mm) 42

Nagler
82° Apparent Field Eyepieces

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, 12mm focal length range.

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) to be screwed on, which permits use of 2" filters as well as 1¼". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece.
TeleVue eyepieces, Barlows, PowerMates, and Paracorr are warranted to be free from manufacturing and workmanship defects for lifetime from the date of purchase.  This warranty applies to the original purchaser and is not transferable.  Defects covered under this warranty are limited to optical coating and cementing, and normal mechanical operation of the product.  The warranty does not include damage caused by mishandling, alteration, normal wear and tear from use, defects of a subjective nature, or coverage for any product not purchased through an authorized TeleVue dealer.
The original owner must complete a warranty registration card and send it to TeleVue Optics for the warranty to be valid, unless state law supersedes.  In such case, or if warranty cards are not submitted, an original dated sales receipt containing the original purchaser's name will serve as proof of purchase for registration.
If your TeleVue eyepiece, Barlow, PowerMate, or Paracorr requires warranty service, please call TeleVue at (845)469-4551 to discuss the problem and obtain a return authorization.  No returns are accepted without prior authorization.
Warranty work will be performed at TeleVue's discretion and may ONLY be performed by TeleVue Optics.  Warranty is void if work is performed on your product by anyone other than TeleVue Optics.  TeleVue Optics reserves the right to assign warranty service to Authorized Service Centers.  In the event a product cannot be serviced, TeleVue will replace the defective product with a current equivalent.  All shipping and insurance charges are excluded from this warranty.
This warranty gives you specific legal rights.  You may be entitled to other rights which vary from state to state.  For warranty coverage outside the United States, contact your local TeleVue authorized dealer for warranty information.  You may have other rights which vary from country to country.
TeleVue does not assume liability for any other warranty, expressed or implied, made by any other entity.


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