The original 11mm Nagler was long a favorite with discerning observers who wanted a wide field of view at high powers, but with an optical quality that could match their premium telescopes. I still use an original 1989-vintage 11mm Nagler with my 7” Questar and love its images.
This latest version of the 1.25” 11mm Nagler eyepiece uses seven optical elements for optimized performance across a very wide 82° field of view. It makes observing feel like you’re looking through a “picture window on space” rather than through an eyepiece. Several different extra low dispersion glass types and specialized coatings are employed for improved contrast and longer eye relief than previous Nagler designs, even those acclaimed as being among the finest wide field eyepieces available.
At a usable eye relief of 12mm, the 11mm Nagler would normally vignette the field of view for eyeglass wearers. However, since the 82° field is so wide that you can’t see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.
The optical performance is typical TeleVue – well corrected and sharp from edge to edge. There is a slight loss of contrast when compared to an eyepiece with fewer elements, due to the additional lenses needed to achieve the unique combination of very short focal length and very wide field. The loss is minimal though, on a par with the contrast loss in an eyepiece/Barlow combination with the same effective focal length. In the eyes of many observers, however, the “picture window on space” observing experience of its exceptionally wide field more than makes up for any slight contrast loss.
Supplied plastic caps seal both ends of the eyepiece to keep it dust free. A rubber grip ring gives a secure and comfortable grip in all temperature extremes. A groove machined into the chrome barrel of the eyepiece acts as a safety stop to keep the eyepiece secure should the focuser thumbscrew loosen slightly while using the eyepiece.
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