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TeleVue Nagler V 20mm

    
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$499.00
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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 look for yourself and enjoy the "spacewalk experience". The 20mm Nagler Type V replaces the original 20mm Nagler Type II. Refined design using different glass types has allowed the weight to be reduced from a whopping 1045g to just over 450g! Thanks Al!


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.

 

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 breakthrough 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. While other manufacturers may boast impressive field sizes, Televue's philosophy of "showing no field unless it is fine" stresses full field image quality as the ingredient for impressive views.


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