TeleVue Ethos Eyepieces
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Ethos Eyepieces
New Ethos eyepieces deliver a 100 degree wide apparent field of view!
Ethos 21 mm Eyepiece
Maximize your "spacewalk" experience with the 21mm Ethos. Transform your passage through the Milky Way with the 21mm’s nexus of contrast, power and field. Larger deep sky objects and rich star fields are its natural playground. Looking on-axis your field-of-vision is filled with 100º of stars, however wherever you chose to concentrate your attention you’ll see sharpness and richer contrast.Extending the Ethos focal length range to 21mm while maintaining the original performance goals of the rest of the series brings the eyepiece up against the mechanical limits of the 2” barrel and focus constraints. The 21mm provides the maximum true field of view, has no significant vignetting at the edge of the field, and is parfocal with the 31mm Nagler Type 5.
The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3X field area gain. The 21mm’s effective field stop diameter is 36.2mm, bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian, the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic, or 6.5mm with a 26mm Nagler.
Ethos 13 mm Eyepiece
At the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100º of pure Tele Vue quality. With a 13mm focal length evoking the original “Nagler” revolution, the field area of this new eyepiece is more than 50% larger than an 82º field. The Tele Vue Ethos is essentially multiple eyepieces, delivering the true field size of a longer focal length, narrower apparent field eyepiece with the benefits of higher power and darker sky background.Tele Vue 13mm Ethos Specifications
- Apparent Field: 100º
- Focal Length: 13mm
- Effective Field Stop: 22.3mm
- Eye Relief: 15mm (accepts DIOPTRX™ eyesight astigmatism corrector)
- Barrel Size: 2”/1¼”
- Weight: 1.3lbs. / 20.8oz
Ethos 10mm: Filling the Gap!
The 10mm Ethos delivers: 100° apparent field (50% larger in area than 82° Naglers), comfortable eye-relief, (accepts DIOPTRX eyesight astigmatism correctors), distortion correction, high contrast and on-axis sharpness for planetary viewing. It is the “do-it-all” eyepiece perfect for all scopes that can utilize this focal length. And, "filling the hole" between the 13mm and 8mm makes it the ideal centerpiece for a 17mm/10mm/6mm Ethos set.
An important benefit of the combination of large apparent field of view and shorter focal length is that for a given field in the sky, higher magnification results in a darker sky background. Fainter stars become visible and more detail is seen on all deep sky objects. Ethos provides another big magnification/contrast jump, yielding dramatic views simply not previously possible in any telescope. With the smaller exit pupil, eyesight limitations are also reduced.
In addition to matching all the key performance criteria of its 13mm sibling, its lighter weight and smaller diameter makes the 10mm more suitable for use with a binocular viewer.
Tele Vue 10mm Ethos Specifications
- Apparent field: 100°
- Focal length: 10mm
- Effective field stop diameter: 17.7mm
- Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism corrector)
- Barrel size: 2"/1¼"
- Black barrel diameter: 61 mm
Ethos 6mm & 17mm Eyepieces
It’s been quite a challenge to develop new Ethos eyepieces to the same performance standards achieved by the 13mm and 8mm models, perhaps the most honored in history. The increased field of the 17mm and increased power of the 6mm will open up new visual experiences that Galileo could hardly have imagined, from small refractors to the largest Dobsonians.
17mm Ethos Specifications
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6mm Ethos Specifications
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Ethos 8: The GR8!
In addition to matching all the key performance criteria of its 13mm sibling, the new 8mm version is parfocal in 1¼" focusers with Radians, Plössls, Type 6 Naglers and 1¼" Panoptics. Further, its lighter weight and smaller diameter than the 13mm Ethos makes the 8mm suitable for anyone using a binocular viewer. Another application is for spotting scope set-ups with the Tele Vue 60° 1¼" diagonal. In comparing it to our 8–24mm Zoom eyepiece, the 8mm Ethos has the power of the 8mm Zoom and 83% of the field of the 24mm setting!
- Apparent field: 100°
- Focal length: 8mm
- Effective field stop diameter: 13.9mm
- Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism corrector)
- Barrel size: 2"/1¼"
- Black barrel diameter: 53.4mm
- Weight: 0.95 lbs (15.2 oz.)
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