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TeleVue Nagler VI 13mm

    
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$339.00
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Description

The Nagler eyepiece was revolutionary as the first eyepiece to deliver breath taking wide fields of view while still providing sharp images from edge to edge.

Take a look for yourself and enjoy the "spacewalk experience".

The Type 6 Naglers boast more eye-relief, contrast, and true field of view in the shorter focal lengths, while maintaining the absolute sharpness of the originals.


The eyepiece is an extremely important, but often over looked element in the image your telescope delivers. In contrast to the objective of your telescope which rarely covers an image angle of more than 2°, the eyepiece has to remain sharp over an angle of more than 50°...or a staggering 82° in the case of the Nagler. For this reason extreme care must be taken to correct for aberrations - especially away from the optical axis.

 

Astigmatism and field curvature are 2 factors that most influence the off axis sharpness especially in "fast" objectives (below f/6). Eyepiece designers had tried for many years to eliminate these aberrations but it was not until the 1980s that a breaktrough occurred - the Nagler eyepiece.

 

Since then Al Nagler has refined this series of eyepieces taking advantage of different exotic glasses and improved coatings to deliver quite simply the best performance you can get out of an eyepiece.

 

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 sized about the same as the original 7mm! Weight about 0.4 to 0.5 lbs.

 

Concept: The goal we set 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.

Model #                                          EN6-13.0
Focal Length (mm)                      13
Barrel Size (in.)                             1¼"
Apparent Field of View (deg.)     82
Eye Relief (mm)                           12
Weight (g)                                      180
Field Stop (mm)                           17.6
Lens elements/groups:              7/4
Awards
31mm T5...
31mm T5

 

 
 
 
 
 
 
 
 
Reviews

 

I also tested their 13mm Nagler Type 6, which yields an exceptional, wide-field, 36x view. The 40x (or so) wide field view is becoming one of my favorite all-purpose views, with enough power for detail and enough field for locating and following birds: the best of both worlds.

— S. Ingraham. "Tele Vue Upgrades!". Better View Desired (April 2003). Full Review.

 

 

Amid the dropped jaws and humorous comments were realizations that this enormous 2-inch, 2.2-pound eyepiece delivers almost the maximum field of view possible with an eyepiece of 31-millimeter focal length. Using exotic glass and six elements, it has an apparent field of 82°, a field stop 42mm in diameter, and 19-mm of eye relief. Fitted to the same telescope, the 31-mm Nagler Type 5 will show 135 percent more true sky than the 20-mm Nagler Type 2 and 82 percent more than the 22-mm Nagler Type 4, while offering nearly twice the maginfication of the Tele Vue 55-mm Plossl.

— Sky & Telescope, (Editors). "Hot Product: Pushing The Envelope". Sky & Telescope (Dec. 1999).

 

 

The ultimate low-power eyepiece is the six-element 31mm Nagler Type 5.

— T. Dickenson, A. Dyer. "Eyepieces/Nagler-Class Eyepieces". The Backyard Astronomer's Guide (3rd edition). p.74 (image caption).

 

 

Despite the presence of no less than seven optical elements, these [Nagler] eyepieces provide images which are noticeably brighter than those obtained with many quality orthoscopics, with superb image sharpness and contrast. Even though these oculars are quite expensive, the serious planetary observer would do well to consider employing this type.

— D. Parker, et al. Introduction to Observing and Photographing the Solar System. p. 14.

 

 

Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is, the aberrations of one cancel out the aberrations of the other, producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough.

— T. Dickenson, A. Dyer. The Backyard Astronomer's Guide.

 

 

The advantages can be summarized as follows: an 82 degree wide field with unexcelled image sharpness to the extreme edge. This is true even for fast focal ratios; lateral color is very low compared with other widefield eyepieces; the eye relief is very large for a 13mm focal length... . In our view these advantages make this eyepiece one of the most remarkable optical developments for the amateur.

— M. van Venrooij. Telescope Making Magazine.

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