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TeleVue Ethos 13mm Eyepiece, 100-degrees, 2" & 1.25" - BLACK FRIDAY

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in In stock (2)
Model
ETH-13.0
Weight
0.90 kg
Focal Length (mm) 13 Eye Relief (mm) 15 Angular Field of View (degrees) 100 Size (inches) 1.25" & 2"
RRP:
£551.00
Our price:
£495.90
10%

including VAT 20.00 % ( £82.65 )
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TeleVue Ethos 13mm

100° Apparent Field Eyepiece

CHRISTMAS PROMOTION TILL 27 DECEMBER!

FREE UK SHIPPING!


“Absolutely amazing contrast. This eyepiece takes visual observing to the next dimension.”
— G.S., ON

Tele Vue have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so, they were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm).

However, since many of their customers have been thrilled with the experience, Tele Vue have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm, (or 0.75-mm for pairing a first production unit with current production) they decided to make this small change public, in case you want to give it a try.

 

Ethos

100° & 110° Apparent Field Eyepieces

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.

Related Links

Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Model # ETH-13.0
Focal Length (mm) 13
Barrel Size (in.) 2" & 1.25"
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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