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TeleVue 17mm Nagler Type 4

5.0 out of 5 stars
5 customer reviews

Nagler Type-4 Eyepieces

Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements. 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.

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.

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

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Customers Reviews

Total 5 reviews
5.0 out of 5 stars

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Most Helpful Customer Reviews

Outstanding for deep sky

By Albert Bellg on October, 17th 2009

Very happy with this eyepiece. Its my favorite for examining discrete deep sky objects, with excellent contrast and sharpness to the edge of the field. I find that the Instajust eyeguard allows for individualized framing of the view and is easy to use, although there is some range of opinion about it. Very comfortable eye relief. Highly recommended!

Very Contrasty Views

By Kimball Corson on October, 17th 2009

Fabuluous contrast and apparent sharpness, but does not provide a relaxed comfortable view. Black out will be a problem for some.

High Definition!!!

By David Landreth on October, 17th 2009

just when i thought it couldnt get any better than the 12mm t4 nagler, i purchased the 17mm t4 & all i can say is unbelievable!! pinpoint stars across the entire 82 degree afov!! wow !! i really like the instajust eyeguard, it takes a little getting used to but once you do nothing else compares!!

Great EP for DSOs.

By Roger Raubach on October, 17th 2009

After year of using this eyepiece , I find that I most frequently use it while viewing galaxies and trying to track down small planetary nebulae. Thanks to this fine EP , I was able to complete the Messier list in short order. By coupling a wide FOV with adequate magnification , it has given me the best views I have had of the Leo Triplets and the M81 , M82 galaxy pair. The f.l. of the EP yields enough magnification in my TOA 130 and my TMB 175 to effectively enhance contrast by darkening the field while maintaining a wide enough field to view either large objocts or groups of seperated galaxies. I rated this EP as a 9 stars in comparison to my Panoptic 35 , which I rated 10 stars ; this is based on viewing comfort. I find I have to work a bit to avoid an occasional blackout with the Nagler , and not with the Panoptic.

17mm Nagler type 4

By Theodore Mattas on October, 17th 2009

I use this eyepiece with my 10SN f/4 and I have to say that it feels as if you look from a spacecraft window!! Amazing wide field views, high contrast, sharp image. A must have for anyone who loves wide field views from a large aperture scope.

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