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TeleVue Nagler (Type-4) 17mm Eyepiece, 82-degrees, 2"

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Model
EN4-17.0
Weight
1.10 kg
Focal Length (mm) 17 Eye Relief (mm) 17 Angular Field of View (degrees) 82 Size (inches) 2"
RRP:
£399.50
Our price:
£349.50
13%

including VAT 20.00 % ( £58.25 )
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TeleVue Nagler (Type-4) 17mm

82° Apparent Field Eyepieces

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Nagler Type-4 17mm Eyepieces

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 proper eye distance and centration.

For deep sky viewing, the comfort, clarity and contrast gets us closer to our "spacewalk" viewing goal.

Model # EN4-17.0
Focal Length (mm) 17
Barrel Size (in.) 2"
Apparent Field of View (deg.) 82
Eye Relief (mm) 17
Weight (lb / oz) 1.60 / 25.6
Field Stop (mm) 24.3

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 31mm, 16mm and Nagler Type-6 with focal lengths of 13mm, 11mm, 9mm, 7mm, 5mm, 3.5mm, 2.5mm.

The Type-5 permits the largest true field possible (31mm has 42mm field stop).

Type-6 models have shorter focal lengths, 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 22mm, 17mm, 12mm focal length range.

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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

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.

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