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TeleVue Ethos 8mm Eyepiece, 100-degrees, 2" & 1.25"

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in In stock (2)
0.90 kg
Focal Length (mm) 8 Eye Relief (mm) 15 Angular Field of View (degrees) 100 Size (inches) 1.25" & 2"
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including VAT 20.00 % ( £93.83 )

TeleVue Ethos 8mm

100° Apparent Field Eyepiece


“Wow! I was told the eyepiece wouldn't make that much difference - wrong! It is a whole different experience. I have ordered an Ethos 13 & 21 as a result.”

— C.Q., CA

In 1.25" mode, if you use TeleVue's "high-hat" 2"-1.25" adapter, it will be parfocal with TeleVue's Plössls, Radians, Type 6 Naglers, Nagler Zooms, 1.25" Panoptics and 6mm ETHOS. Further, its light weight and small diameter makes the 8mm suitable for anyone using a binocular viewer. Another application is for spotting scope set-ups with the TeleVue 60° 1.25" diagonal.


TeleVue Ethos

100° & 110° Apparent Field Eyepieces

TeleVue 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 TeleVue President David Nagler, with performance parameters giving it the fundamental characteristics (the ethos) of a TeleVue 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 TeleVue'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.

Introduced at the 2007 Northeast Astronomy Forum, TeleVue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure TeleVue quality. The field area of this new eyepiece is more than 50% larger than an 82° field. The TeleVue 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-08.0
Focal Length (mm) 8
Barrel Size (in.) 2" & 1.25"
Apparent Field of View (deg.) 100
Eye Relief (mm) 15
Weight (lb / oz) 0.95 / 15.2
Field Stop (mm) 13.9

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