Tele Vue 31 mm Nagler Type 5 Eyepiece
View the Cosmos Like Never Before!
Purpose-built for a wide-field, immersive experience, the Tele Vue Nagler series aims to deliver an expansive field of vision to resemble that of naked-eye observing. Not only can you expect stunning, wide field sights, but the premium construction and optical design provide the highest degree of sharpness and viewing comfort. The “showing no view unless it’s fine” principle from Tele Vue stresses full field image quality as the main ingredient for impressive views—offering tack-sharp stars within a large scope of vision.
Designed by Al Nagler, the founder of Tele Vue and an excelled optical engineer affiliated with multiple NASA projects, the Nagler eyepiece series is a standout option for your stargazing endeavors. These eyepieces are designed to take your observations to the next level, providing a panoramic, “spacewalking” experience for unforgettable nights under the stars. With this 31 mm Type 5 Nagler Eyepiece, the unique 6-element design uses four exotic glasses, maintaining the contrast offered by the 22 mm Type 4 Nagler while achieving a true field area 41% larger! Owners of fast telescopes can enjoy a larger true field of view, free of secondary shadowing, than ever before. In addition to the high performance optical design, the premium build quality further enhances your experience. Blackened lens edges, anti-reflection threads, and rubber eyeguards deliver maximum contrast, while the 19 mm of eye relief provides comfortable viewing. This Tele Vue Nagler features a focal length of 31 mm, offering beautiful, wide views of the Andromeda Galaxy, the Hercules Star Cluster, and a host of other large deep space objects. Transform your observation sessions from mundane to exceptional with this Tele Vue 31 mm Nagler Type 5 Eyepiece today!
Stunningly Sharp, 82° Views
By delivering optics designed by the elites to everyday space enthusiasts, Tele Vue helps deepen the passion of backyard astronomers far and wide. Nagler’s aim to provide a “spacewalking” sensation with the expansive 82° field of view makes this eyepiece a must have. Read on as we take a deeper look at the qualities of this Tele Vue 31 mm Nagler Type 5 Eyepiece below!
The Ingenuity Behind the Nagler Design
So, what exactly is offered by the Nagler eyepiece series? With his experience on NASA’s Gemini and Apollo programs, Al Nagler, the founder of Tele Vue, took his expertise on optical engineering to deliver a scope of vision so expansive it feels like you’re floating through the cosmos themselves. The wide 82° apparent field of view with pinpoint stars edge to edge offer more than just a “looking through a tube” experience, it delivers an immersive window to the universe. Multiple types of Nagler eyepieces are offered, though four in particular are widely available: the Type 4, 5, 6, and 7. Type 5 Nagler eyepieces set themselves apart from previous Type 4s by offering a more compact form factor, making these models particularly useful for those who utilize Dobsonian telescopes where proper balance is key.
Top-Tier Build Quality
Boasting a high-grade anodized aluminum body, this Nagler eyepiece provides exceptional durability. The premium, all-metal casing upholds the integrity of the six internal optical components and ensures precise optical alignment for years to come. This means even with repeated use, stark, beautiful sights are readily accessible. Enhancing your views, the blackened lens edges and anti-reflection threads ensure the utmost contrast. 2” in size, enjoy seamless compatibility with a host of focusers on the market today! This large barrel size and effective field stop of 42 mm enables a wider field of view than other standard 1.25” eyepieces on the market, making it a choice eyepiece for deep space exploration. The rubber eye guards help you comfortably view the cosmos, while the low weight of 2.2 lbs.enables effortless transport for all of your astronomy adventures.
31 mm of Focal Length
In order to take full advantage of your telescope’s light gathering power, finding the right combination of telescope focal length and eyepiece focal length (i.e. your system’s magnification) helps you achieve the best views possible. Not only does this ratio help you determine what celestial objects can be viewed, it also gives insight into how clear the image will be based on your local seeing conditions. Under good seeing conditions, it’s best to capitalize on this still air by utilizing higher magnifications, while lower magnifications help you make the most out of poor seeing. The formula for magnification is as follows: Telescope Focal Length ÷ Eyepiece Focal Length. Pairing this 31 mm Tele Vue Nagler eyepiece with a standard 1200mm focal length Dobsonian yields a magnification of 38.7x—a low power rate for a viewing a wide variety of large deep space objects across all levels of seeing! For a more in-depth look at this topic, be sure to check out our Telescope Eyepiece Guide found within our Astronomy Hub.
Understanding the Exit Pupil
The exit pupil is the beam of light exiting your eyepiece. It’s an important factor in determining how bright the image through an eyepiece will be. We measure the exit pupil by its diameter in millimeters, with the bigger the diameter, the brighter the image. Large (5-7 mm) and medium (2-5 mm) exit pupils are wonderful for faint deep sky objects. Small exit pupils (<2 mm), on the other hand, prove to be useful for planetary or lunar viewing. Calculating the exit pupil of your eyepiece/telescope combination is super easy: Exit Pupil = Telescope Aperture (mm) ÷ Magnification, or Exit Pupil = Eyepiece Focal Length ÷ Telescope Focal Ratio. This Tele Vue Nagler Type 5 Eyepiece has a focal length of 31 mm. When paired with a standard f/6 telescope, the resulting exit pupil will be 5.17 mm, making this eyepiece a great choice for observing galaxies, nebulae, star clusters, and more!
Astronomy Hub: Your one-stop-shop for Astronomy Knowledge!
Our Gear Experts have compiled a wealth of information to help you get the most out of your telescope! Below you’ll find links to articles, videos and "how-to" guides. Just one more reason that our Astronomy Hub is a one-stop-shop for all your astronomy and astrophotography needs!
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