The 31 mm Tele Vue Nagler Type 5 Eyepiece with a 2" barrel is made with a unique 6-element design using four exotic glasses, maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22 mm Type 4! Owners of fast Dobsonian/Newtonians can enjoy a larger true field, free of secondary shadowing, than ever before. For example, a 12.5 inch, f/4.5 scope with a Paracorr will deliver a 1.5 degree field (3 Moon diameters), at 53x with a 6 mm exit pupil.
Tele Vue Nagler Eyepieces
"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 '70s 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
Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! Blackened lens edges, anti-reflection threads, and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25 inch models (12 mm Nagler Type 4 and 22 mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2 inch/1.25" barrel models have an additional feature allowing the 2 inch extension tube (EBX-2120) to be screwed on, which permits use of 2" filters as well as 1.25 inch. 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece.
OPT Product Number: TE-EN5-31.0