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Televue Ethos Eyepieces

Ethos
100° & 110° Apparent Field Eyepieces

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Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepieces brings new meaning to the term "in-house." The concept for this eyepiece series was proposed by Tele Vue President David Nagler, with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast, comfortable eye relief and full field sharpness. Control of astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity for daytime use were specified criteria.

Following Tele Vue's philosophy of pushing the state of the art, long-time Tele Vue employee and optical design protégé Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al's guidance, Paul tweaked his design to fulfill the original goals.

While sharpness is inherent to the optical design, contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings tuned to the composition of each element.

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. The field area of this new eyepiece is more than 50% larger than an 82° 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.
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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.
The left chart has circles representing field diameters of 50°, 60°, 68°, 82° and 100° with the telescope distance set so that the 100° circle matched the view of the Ethos field-stop. The “crosshairs” are actually small Saturn drawings in 5° increments to illustrate the linear angular-magnification correction. Illustrations of Saturn were placed at the center and edge of the field so contrast and detail (including newsprint dot patterns) could be evaluated.The chart to the right is an artificial very-rich “star field” made (and conceived) by Rick Scheck in our scope production dept. The bright “star” reflections made a more realistic contrast simulation than simply viewing astronomical pictures and helped to give a “night sky” impression that nicely represented a dense Milky Way star field.

Real night-sky viewing was done two nights at the dark Prude Ranch location of the Texas Star Party using telescopes ranging from our NP127is to the prize winning 12” f/5.5 Newtonian of our own Scott Ewart. Ethos also made its way into various large Dobsonians including those of Barbara Wilson and Larry Mitchell. At the Riverside Telescope Makers Convention in California, we had two clear, though very bright moonlit nights for evaluation. Using an NP101 and NP127is Ethos treated us to clusters such as M44 and M24. At EPOCH 2007 in western Indiana, we were pleased to have one very clear evening to demonstrate Ethos with our NP127is and Chris Brownewell's 25" Obsession. Good Luck, Chris, on this new star party venture, and a big Thanx for being a great host.

On a personal note, I was especially moved by just showing a random star field to a little 10-year-old girl in a group visiting RTMC from Anaheim. Her only words: “Oh my gosh, it’s beautiful.” It doesn’t get any better than that.- Al Nagler

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Televue 21mm Ethos Eyepiece - 2"

* The Televue 21mm Ethos Eyepiece provides a 100° apparent field for a true "spacewalk" view of the night sky. * With an effective field stop diameter of 36.2mm, the true field of the 21mm Ethos is close to that of the much loved 35mm Panoptic. * Televue 21mm Ethos Eyepiece provides a generous 15mm of eye relief for comfortable observing. * Accepts DIOPTRX eyesight astigmatism correctors. * The Tele Vue 21mm Ethos Eyepiece has a dedicated 2" barrel. * Dramatic mid-level magnification views combine with stunning wide field backgrounds.


Our price: $830.00 (€722.10)
Market price: $1075.00 , save 23%
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Televue 17mm Ethos Eyepiece - 2"

 

Ethos
100° & 110° Apparent Field Eyepieces
 

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17-mm
Model # ETH-17.0
Focal Length (mm) 17
Barrel Size (in.) 2"
Apparent Field of View (deg.) 100
Eye Relief (mm) 15
Weight (lb / oz) 1.55 / 24.8
Field Stop (mm) 29.6
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Our price: $735.00 (€639.45)
Market price: $950.00 , save 23%
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Televue 13mm Ethos Eyepiece - 1.25"/2"

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13-mm
Model # ETH-13.0
Focal Length (mm) 13
Barrel Size (in.) 2" & 1¼"
Apparent Field of View (deg.) 100
Eye Relief (mm) 15
Weight (lb / oz) 1.30 / 20.8
Field Stop (mm) 22.3
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Our price: $610.00 (€530.70)
Market price: $780.00 , save 22%
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Televue 10mm Ethos Eyepiece - 1.25"/2"

 

10-mm
Model # ETH-10.0
Focal Length (mm) 10
Barrel Size (in.) 2" & 1¼"
Apparent Field of View (deg.) 100
Eye Relief (mm) 15
Weight (lb / oz) 1.10 / 17.6
Field Stop (mm) 17.7
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“Fantastic accomplishment of optical engineering!”
—S.B., GA

Our price: $610.00 (€530.70)
Market price: $780.00 , save 22%
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Televue 8mm Ethos Eyepiece - 1.25"/2"

* Sky & Telescope Hot Products 2010 WInner! * The Televue 8mm Ethos eyepiece provides a 100° apparent field for a true "spacewalk" view of the night sky. * Distortion correction, high contrast and on-axis sharpness for planetary viewing. * Televue 8mm Ethos eyepiece provides a generous 15mm of eye relief for comfortable observing. * Accepts DIOPTRX eyesight astigmatism correctors. * The Televue 8mm Ethos eyepiece will fit either 2" or 1.25" barrel sizes and weighs 0.95 lbs (15.2 oz.). * Dramatic high magnification views combine with stunning wide field backgrounds suitable for use with binocular viewers.


Our price: $575.00 (€500.25)
Market price: $740.00 , save 22%
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Televue 6mm Ethos Eyepiece - 1.25"/2"

* Sky & Telescope Hot Products 2010 WInner! * The Televue 6mm Ethos eyepiece provides a 100° apparent field for a true "spacewalk" view of the night sky. * Distortion correction, high contrast and on-axis sharpness for planetary viewing. * Televue 6mm Ethos eyepiece provides a generous 15mm of eye relief for comfortable observing. * Accepts DIOPTRX eyesight astigmatism correctors. * The Televue 6mm Ethos eyepiece will fit either 2" or 1.25" barrel sizes and weighs 0.97 lbs (15.5 oz.).


Our price: $575.00 (€500.25)
Market price: $740.00 , save 22%
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Televue 4.7mm Ethos SX Eyepiece- 1.25"/2"

# This TeleVue Ethos SX Eyepiece is offered in a 1.25"/2" barrel format with a 4.7mm focal length. # Designed and crafted to combine its exceedingly wide field of view - the same as the LEM Simulator optics. # This TeleVue Ethos SX Eyepiece offers high contrast, color-rendition, distortion correction and center-to-edge sharpness needed to achieve that natural view. # Small exit pupil yields a darker background to enhance contrast. # Delivery is anticipated to begin in late 2011 or early 2012


Our price: $610.00 (€530.70)
Market price: $780.00 , save 22%
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Televue 3.7mm Ethos SX Eyepiece - 1.25"/2"

Model: 3.7mm Ethos-SX 110 (Simulator eXperience) Apparent field: 110° Focal length: 3.7mm Effective field stop diameter: 7.04mm Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism corrector) Weight: 1.10 lbs / 17.7 oz.; 2" adapter/stand: 2 oz. Availability: late Summer/early Autumn


Our price: $610.00 (€530.70)
Market price: $780.00 , save 22%
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