With  Paul's  help,  Al's  initial  dream  for  amateur astronomers is now fully realized.
The 3.7mm Ethos-SX is designed and crafted to combine its exceedingly wide field  of  view  with  all  the  contrast,  color-rendition, distortion  correction  and  center-to-edge  sharpness needed to achieve that natural view.
Beyond the desire to simply achieve 110°, the extended field of view gave Tele Vue the ability to produce a superb planetary eyepiece with a deep sky true field of view that logically fits within the rest of the Ethos eyepiece line.
With 110°, the Ethos-SX has 21% more AFOV area than the 100° Ethos design.
This permits a nice 62% power increase from a 6mm Ethos, while retaining 68% of its TFOV.
The 3.7mm actually has more TFOV than our 8mm Plössl, 6mm Radian, and 5mm Nagler Type-6!

The 3.7mm is a 1¼" format and is parfocal with the wide range of 1¼" Tele Vue Plössls, Panoptics, Radians, Naglers, Nagler Zooms, and 6mm and 8mm
 

                   Ethos 3.7mm SX Eyepiece 
  with 2" adapter,    without 2” Adapter,     2” adapter
 
Ethos eyepieces. The screw-on 2" adapter (included) is designed to make it parfocal with 13mm and 10mm Ethos when they are used in their 2" modes…Hey, it also doubles as a functional display stand!
We don't think we can aptly describe Al’s original experience of “flying over the moon,” but for the first time, YOU can experience what the astronauts saw four decades ago.

Specifications
· 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.
· Price (similar to 10mm Ethos) includes 2" adapter
· Availability: late Summer/early Autumn

Hang on, TeleVue has a new baby!
announced 14/08/09 at Stellafane

They just keep doing it (while others just copy)

Ethos 21mm: Maximize your "spacewalk" ...
Ethos 21mm

Focal Length:  21mm
Apparent Field:  100°
Eye Relief:  15mm
Effective Field Stop Dia.: 36.2mm
Barrel Size:  2"
Weight:  2.25 lb.

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.

The optical performance of the 21mm is the work of Ethos lead designer Paul Dellachaiae, who achieved a level of optical aberration correction right in line with his other Ethos designs. Contrast and transmission have been maximized using the same advanced coating techniques and further aided by the internal mechanical design techniques used in all Tele Vue eyepieces.

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.

Like all Tele Vue eyepieces, every 21mm Ethos goes through our optical and cosmetic quality control procedure in Chester, NY and should your eyepiece ever need service we can do everything from replacing a dented barrel to replacing a scratched eyelens.

Since all Ethos models accept Dioptrx, you now also have the “final frontier” – the ability to compensate for your own eyesight astigmatism with a superb multi-coated lens providing your exact correction, rotation orientation and centration over the eyepiece. This is the culmination of our quest to not only bring you observing experiences “…even better than you imagined,” but a 30-year recognition of being “tops in the field.”
 
 

Ethos 10mm: Filling the Gap!
Some Holes Just Need To Be Filled!

First Editorial Impression
We got our first peek through Tele Vue's latest Ethos, the 10-mm, and its performance was truly as incredible as any in that growing family of hyperwide, supremely-corrected, high-fidelity eyepieces. You'll have to try one in person to understand the significance of Tele Vue's accomplishment - words cannot capture the experience.
—"Industry News / NEAF 2009", Astronomy Technology Today, (May/June 2009),p14
 
 

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
    * Weight: 1.10 lbs (17.7 oz.)
    * Availability: in-stock
 
 

New Arrivals: Ethos 6mm & 17mm!

Celebrate the start of the International Year of Astronomy 2009, the 400th anniversary of Galileo's first use of an astronomical telescope, by showing friends and neighbors the best of our wonderful universe. The Tele Vue philosophy (Ethos, if you will) has always been about inspiring “spacewalk” vistas by creating the finest “rich field” refractors and wide angle eyepieces. We hope the introduction of these new Ethos models will further rekindle the appreciation of astronomy and support all the worthy goals of IYA 2009. 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. We hope 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

    * Apparent field: 100°
    * Focal length: 17mm
    * Effective field stop: 29.6mm
    * Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism correctors)
    * Barrel size 2”
    * Weight: 1.55 lbs (24.8 oz.)
 

6mm Ethos Specifications

    * Apparent field: 100°
    * Focal length: 6mm
    * Effective field stop: 10.4mm
    * Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism correctors)
    * Barrel size: 2”/1¼”
    * Weight: .97 lb/15.5 oz.
 
 
 
 

At NEAF 2008 TeleVue were pleased to demonstrate a new 100° AFOV Ethos eyepiece in an 8mm focal length.
In addition to matching all the key performance criteria of its 13mm sibling, the new 8mm Ethos 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!

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.

8mm 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.

Tele Vue 8mm Ethos Specifications
· 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.)
· Availability: July 2008; orders now being accepted

I want to order one
 

Tele Vue 13mm Ethos™

Introduced at Northeast Astronomy Forum 2007
Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term “in-house.” The concept for this eyepiece was first 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 (technical reference), 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.

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.

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.

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: 1.24lbs.
 
 

The Ethos has now been shown at NEAF, TSP and RTMC. We thought you’d enjoy sharing in the experience by reading some of the comments written in our “comment” notebook. The following display was created for daytime observation using the Ethos in an NP127is at NEAF and TSP, and an NP101 at RTMC.

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.

While all of us at Tele Vue are proud and excited by the response, it’s much more interesting for you to note the recorded comments. 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 god, it’s beautiful.” It doesn’t get any better than that.

Al Nagler
Kudos to our Paul Dellechiaie, the principal designer of Ethos.

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