Tele Vue 17 mm Ethos 2" Eyepiece with Free Case
Redefining Wide-Field Excellence: The Tele Vue Ethos 17mm Eyepiece!
Includes Free Eyepiece Case
Receive a free eyepiece case when you buy this eyepiece from High Point Scientific! You will love the way the two piece “bolt-style” case threads together to securely protect your new eyepiece from dust, moisture, and scratches during storage.
Building upon the legacy of the Tele Vue Nagler eyepiece series, the Ethos series features everything excellent about the Naglers, though with a 50% increase in the apparent field of view! First proposed by Tele Vue President David Nagler, this Ethos eyepiece series needed to include the fundamental characteristics (the ethos) that mark Tele Vue quality: high contrast, comfortable eye relief, and full field sharpness. After careful craftsmanship and oversight by Tele Vue founder Al Nagler himself, the Ethos eyepieces deliver next-level viewing experiences, making them a must have for those seeking expansive, wide sights with impeccable sharpness from edge to edge!
Featuring an impressive 100° AFOV, this Tele Vue 17 mm Ethos 2” eyepiece provides panoramic views and delivers a “floating through the stars” feeling. These broad vistas set the Ethos eyepieces apart from the rest, immersing you within the cosmos like never before. The 17 mm focal length is wonderful for beautiful, in-depth views of the Triangulum Galaxy, the Orion Nebula, the Whirlpool Galaxy, and a host of other cosmic wonders. Exceptional control of astigmatism, field curvature, lateral color, and angular magnification distortion correction further enhance your experience, offering top-of-the-line clarity and contrast! This can be attributed to the high degree of precision Tele Vue is widely renowned for, delivering stark sights of your favorite celestial objects night after night. In addition to the incredible optical performance, the demonstration of Tele Vue quality continues within the physical body of this eyepiece. Feel free to utilize a wide variety of focusers with the 2” barrel size, while the blackened lens edges, anti-reflection threads, and rubber eyeguards deliver maximum contrast. Blending precision, performance, and versatility, this premium eyepiece is a perfect addition to your astronomy toolkit!
100° of Uncompromised Clarity
Harnessing the precision craftsmanship of Tele Vue, you can expect stunning sights through this 17 mm Ethos eyepiece. Their commitment to providing top-tier performance gives way to sharp stars across the full field of view and beautiful, bright detail against an inky black sky, helping you deepen your love for astronomy. Read on as we take a deeper dive into the aspects of this high quality Tele Vue 17 mm Ethos 2” eyepiece below!
The Elegance of the Ethos Design
Paul Dellechiaie, a long-time employee and optical design protégé, aimed to stretch the horizons of Tele Vue optical quality, delivering this state-of-the-art Ethos eyepiece series. With help from Al Nagler, the founder of Tele Vue and genius behind the highly successful Nagler eyepiece series, Tele Vue once again pushes the boundaries of exceptional nights under the stars, offering pristine sights across a 100° field of view. This eyepiece line provides 50% more visual area than the Nagler series, for more immersive views than ever before! In addition to a large scope of vision, you can expect maximum contrast thanks to the ingenuity of flat finished baffles, ultra low reflectance, and high efficiency coatings fine-tuned for each optical component.
First-Class Build Quality
Boasting a high-grade, black, anodized aluminum body, this Ethos eyepiece provides impressive durability. The premium, solid build upholds the performance of this 17 mm eyepiece, ensuring stark, high contrast sights even with extensive use! With the commitment to quality from Tele Vue, blackened lens edges, anti-reflection threads, and internal baffles further the already exceptional performance of this eyepiece by maximizing contrast and reducing stray light. The rubber eye guards help you comfortably view the cosmos, while the low weight of 1.55 lbs.enables effortless transport for all of your astronomy adventures. Compatible with 2” focusers, feel free to utilize a wide variety of telescopes on the market today. This Tele Vue Ethos eyepiece features an effective field stop of 29.6 mm and an eye relief of 15 mm.
17 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 17 mm Tele Vue Ethos eyepiece with a standard 1200mm focal length Dobsonian yields a magnification of 70x—a wonderful mid-range rate for viewing a wide variety of deep space objects across low to average seeing conditions. For a more in-depth look at this topic, be sure to check out our Telescope Eyepiece Guide found within our Astronomy Hub!
Understanding Exit Pupil
The exit pupil is the beam of light exiting your eyepiece. It’s an important factor in determining both how bright the image through an eyepiece will be, and how wide. We measure the exit pupil by its diameter in millimeters, with the bigger the diameter, the brighter the image and the wider the field of view will be. 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 Ethos Eyepiece has a focal length of 17 mm. When paired with a standard f/6 telescope, the resulting exit pupil will be 2.8 mm, making this eyepiece a great choice for observing medium-sized nebulae, larger galaxies, the entire disk of the Moon, 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!
| The Best Telescopes of the Year |
| Best Telescopes For Urban Stargazing |
| What's in the Sky This Month? |
