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TeleVue 17mm Nagler Type 4

17mm Eyepiece.  All Tele Vue eyepieces listed have full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, and filter threads. They are all based on patented designs by Al Nagler and are individually tested to be diffraction limited on-axis.

$388.99
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.

17-mm
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
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.

17-mm
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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Existing reviews
Outstanding for deep sky
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!
From: abellg@new.rr.com | Date: 10/16/2009 1:48 PM
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Very Contrasty Views
Fabuluous contrast and apparent sharpness, but does not provide a relaxed comfortable view. Black out will be a problem for some.
From: kcorson@qwest.net | Date: 10/16/2009 1:48 PM
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High Definition!!!
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!!
From: vpdwl@aol.com | Date: 10/16/2009 1:48 PM
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From: donovan@donconrad.com | Date: 10/16/2009 1:48 PM
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Great EP for DSOs.
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.
From: rraubach@vcn.com | Date: 10/16/2009 1:48 PM
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17mm Nagler type 4
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.
From: t_mattas@hotmail.com | Date: 10/16/2009 1:48 PM
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I considered a long time whether to buy the 20mm Pentax XW or the 17mm Nagler Type 4. In the end I settled on the 17mm Nagler Type 4 for a few reasons. Firstly it has the widest AFOV (most immersive). Secondly, it allows the use of TV Dioptrix. Thirdly, it is 17mm and gives a smaller exit pupil which is better for my astigmatic eye. Fourthly, it allows the use of spectacles (I can see the whole AFOV with my spectacles). Fifthly it provides a higher magnification and also a darker background due to the smaller exit pupil.

I use the 17mm Nagler on my Obsession 12.5 inch. It is really WOW. The views of open clusters, nebulae and globular clusters are breathtaking. When looking at the dumbbell nebula, the nebulaue stood up as though it was floating among the pinpoint stars (up to the edge) and the background was dark black. Globular clusters also looked floating and highly resolved. The Apparent Field of View is really so wide. It gives the wow feeling everytime I look in it and it is definitely much wider than a Pentax 20mm XW which I have seen through quite many times.

The drawbacks are is weight (which is not a problem with my Obsession), the cost (well it is justified) and the barlow lens at the bottom of the eyepiece. I have to take good care of the eyepiece because the barlow lens at the bottom of the eyepiece is very curved and near the edge of barrel. Other than all these drawbacks, I feel that it is really an excellent eyepiece. Look no further if you want a truly immersive eyepiece! It gives lasting memories.  
From: ybcanopus@yahoo.com.sg | Date: 10/16/2009 1:48 PM
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