Tele Vue 13mm Ethos Eyepiece - 1.25"/2"

Free Shipping
Tele Vue 13mm Ethos Eyepiece - 1.25"/2"
Item # TE-ETH-13.0
  • The TeleVue 13mm Ethos Eyepiece employs flat finished baffles and specialty coatings that are tuned to the composition of each element for maximum contrast.
  • Experience a 100 field of view...more than 50% larger than a Nagler 82 field!
  • The TeleVue 13mm Ethos Eyepiece is available in 2/1 barrel size and yields an incredible 15mm of eye relief.
  • This 13mm focal length eyepiece has an effective field stop of 22.4mm and accepts DIOPTRX eyesight astigmatism corrector.
  • The TeleVue 13mm Ethos Eyepiece gives dramatic mid-magnification views combined with stunning wide field backgrounds suitable for use with binocular viewers.


The Tele Vue 13mm Ethos Eyepiece

At the 2007 Northeast Astronomy Forum in New York, Tele Vue introduced attendees to a new observing experience with personal views through the new Ethos. With a 13mm focal length evoking the original “Nagler” revolution, the field area of this new eyepiece is, at 100º, more than 50% larger than an 82º field. The Televue 13mm Ethos eyepiece 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.

Televue is known for its in-house eyepiece and telescope designs by Al Nagler. Televue's latest eyepiece brings new meaning to the term “in-house.” The concept for the 13mm Ethos eyepiece was first proposed by Televue 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 Televue 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.

The Televue 13mm Ethos eyepiece has now been shown at NEAF, TSP, RTMC, as well as other major astronomy events. The Televue Ethos has been extremely well received by the astronomy community and will be one of the most highly anticipated products to be released in years.

The Ethos has now been shown at NEAF, TSP, RTMC, and EPOCH 2007. 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.

TeleVue Product Number: ETH-13.0

All Televue products are available to ship world-wide from OPT, and effective July 1, 2008, are covered by a Five Year Worldwide Limited Product Warranty! Always be sure to save your original packaging materials should you need to return any Televue product for warranty or repair.


Additional Information

Additional Information

Manufacturer Tele Vue
Optical Design Ethos
Barrel Size 1.25"/2"
Warranty Lifetime Warranty
Eyepiece Field of View - Apparent 100ยบ
Eyepiece Focal Length 13mm
Eyepiece Eye Relief 15mm
Eyepiece Manufacturer Series Televue Ethos
Eyepiece Weight 1 lb. 4.8 oz.
Field Stop 22.3mm
Number of Lens Elements & Groups Not supplied by manufacturer
Special Feature None
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes

Customer Reviews 7 item(s)

Wonderful eyepiece!
I got this eyepiece as a gift. I almost could not believe. This eyepiece is great. To own it means many nights of deep observing pleasure. I could recommend it to all who could afford it.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Darko / (Posted on 10/21/2013)
The best eyepiece I've every used. The 1.25 mount with optional 2 adapter means I can use it on any scope, from my personal 150mm refractor to the 14 at the local astronomy club. Great clarity and brightness.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by / (Posted on 2/13/2012)
What can I say that has not been said? One heck of an eyepiece. I took this baby down to the Everglades the other night and I felt like jumping into the eyepiece. The sky was so black, the stars so sharp, the FOV, endless. M42 was breathtaking, my best view ever!!! Cant wait to get another one to attempt binoviewing with them.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Sergio / (Posted on 4/24/2009)
My favorite eyepiece.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Tim / (Posted on 9/3/2008)
Redefining the ethos of an eyepiece......
1. Always center an object for the best view.
2. The field edge is only good for framing the object.
3. Eyepieces >70 deg FoV are mega-ultra-hyper-uber wide angle. Accept that compromise in edge quality.

How times change!
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Kaustubh / (Posted on 4/9/2008)
Worth every penny..
Scary , this eyepiece brings you there ! Falling in truly does describe the view with this eyepiece. The satisfaction received when viewing through binoculars is duplicated with only one eye with this one , I cant wait to get two of these side by side in a bino configuration ! I do not want to look into the milkyway , I want to STAND IN IT ...and with this eyepiece , YOU DO! Very comfortable and easy to use and after about 15 minutes with it , it is not there and you are in outer space :- , you and scope become one. I have absolutely nothing negative to say about this wonderful eyepiece and 13mm is a nice starting point .
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Dave / (Posted on 12/5/2007)
Amazing (though out of my $ range
On October 13, 2007, I had the pleasure to view some objects with the 13mm TeleVue Ethos, through an 18 Obsession owned by a man named John at CALSTAR 2007. First, I want to thank him again. Second, the eyepiece amazing!!! Views of the Pegasus I galaxy cluster were wonderful. M42 was vivid and it seemed like I was going to fall into the eyepiece. As a hard working law school student, I long for the day when I can afford one of these amazing eyepieces. Al Nagler, thank you too!
1= Houston, We Have a Problem & 5= It's Out of This World
Review by / (Posted on 10/16/2007)
Included Items

Included Items

  • Televue 13mm Ethos Eyepiece for 1.25" & 2" Focusers/Diagonals
  • Televue Caps
  • Televue Box
Questions & Answers

Product Questions

No questions yet. Be the first to ask the question!
Support / Downloads
Related Blog Posts