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Tele Vue 21mm Ethos 2" Eyepiece

SKU: TV21E MFR: ETH-21.0
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Key Features

  • Experience expansive views with the Tele Vue 21mm Ethos eyepiece's impressive 100° apparent field.
  • Enjoy comfortable observations with a generous 15mm eye relief, perfect for long stargazing sessions.
  • The 2" barrel size of this Tele Vue eyepiece ensures compatibility with a wide range of telescopes.
  • Weighing just 2.25 lbs, the 21mm Ethos eyepiece balances premium quality with manageable weight.
  • Achieve edge-to-edge sharpness with this 21mm eyepiece, delivering exceptional image quality.
  • Explore the night sky with confidence using the durable and high-performance Tele Vue Ethos eyepiece.
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Questions & Answers

Shopper : Why Did You Choose This?JAMES W : quality and suggested by salesperson.STUART E : reviews

Reviews about this item

Review Summary

2021-11-26T12:42:36

Rated 5 out of 5

Great eyepiece for your collection

Very easy and smooth ordering process. Came very quickly, even with covid. The eye piece it did the ip's is great regarding the eye relief. Would highly recommend this piece.

BROC R.

2020-10-27T10:17:58

Rated 5 out of 5

Outstanding!

Oh wow!!! It’s so wide I can still use it to do the alignments. But yes views are beautiful.

Dave

2016-03-30T13:09:57

Rated 5 out of 5

It's my go to lense for showing objects in the sky.

The wide angle lets you see the moon close up and fits the entire moon in the viewer. It's my go to lense for showing objects in the sky.

B H.

2013-08-04T21:00:00

Rated 5 out of 5

Best binoview ever in Oberwerk BT-100/45

Scanning starfields across Milky Way yields gazillions of pinpoints of starlight! Serves up clusters, nebulae galore! Observing Saturn yields planetary banding, and gap between planet and rings! Pros: great brightness, contrast and resolution Cons: pricey...

Anightskyguy

2011-10-09T21:00:00

Rated 5 out of 5

Amazing - almost TOO good!

I use it with permanent f/4.5 29-inch Dob, Paracorr and Dioptrx. That's a lot of glass! The field is SO wide that although can see it all looking straight in, must move head to concentrate on edges. Measured throughputs in photometric labs: R=94.7%, G=93.7%, B=91.7% attest to great MARC coatings throughout. Wonderful on remote galaxies. Get one 13mm for your favorite higher mag - full set would be overkill. Use Naglers for other EFLs. Best on fast Dobs, overkill on slow scopes. Buffalo club visited and were all +++ impressed.

TOM D.

2010-01-09T19:00:00

Rated 5 out of 5

More Ethos magic from Tele Vue!

I have used this 6mm eyepiece coupled with a small barlow on a TV-85 to get wonderfully close, sharp views of the moon, planets and other deep sky objects. As with other Ethos pieces, the field of view gives a whole new meaning to the phrase "space walk" - you get the feeling you're looking out a space craft. [...]

TC

2008-11-25T19:00:00

Rated 5 out of 5

EXCELLENT- best view and contrast!!

This is great in both my TV 85 and 4" Genesis. Yes, it is a little expensive but the stunning views will make you forget. Sell a few of your other eyepieces to afford it if you have to. You'll be glad you did.

Tom E.

2008-07-25T21:00:00

Rated 5 out of 5

Stunning views - Tack-sharp across field

I have had the most stunning views of the Moon that I have EVER seen through this eyepiece. The Veil Nebula (with an O-III filter) was breathtaking! I am getting rid of other eyepieces because this is mostly what I use now.

Tom K.

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Tele Vue Ethos Specifications

  • Focal Length

    21mm

  • Apparent Field

    100 Degree

  • Eye Relief

    15mm

  • Field Stop Diameter

    36.2mm

  • Weight

    2.25 lbs (36.0 oz.)

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About Tele Vue Ethos

FEATURED REVIEWS

Stunning views - Tack-sharp across field

By Tom K.

I have had the most stunning views of the Moon that I have EVER seen through this eyepiece. The Veil Nebula (with an O-III filter) was breathtaking! I am getting rid of other eyepieces because this is mostly what I use now.

Amazing - almost TOO good!

By TOM D.

I use it with permanent f/4.5 29-inch Dob, Paracorr and Dioptrx. That's a lot of glass! The field is SO wide that although can see it all looking straight in, must move head to concentrate on edges. Measured throughputs in photometric labs: R=94.7%, G=93.7%, B=91.7% attest to great MARC coatings throughout. Wonderful on remote galaxies. Get one 13mm for your favorite higher mag - full set would be overkill. Use Naglers for other EFLs. Best on fast Dobs, overkill on slow scopes. Buffalo club v...

View full Review

While exploring the celestial wonders, the 21mm Ethos 2" Eyepiece offers an unparalleled "spacewalk" experience. This eyepiece is designed to transform your astronomical journey through the Milky Way, providing a unique blend of contrast, power, and field. It excels in showcasing larger deep sky objects and rich star fields, making it a must-have tool for every stargazer.

The 21mm Ethos eyepiece offers a stunning 100-degree field-of-vision, filled with stars. Regardless of where you focus, you'll experience sharpness and richer contrast, enhancing your overall viewing experience. This superior optical performance is the result of meticulous design by Ethos lead designer, Paul Dellechiaie. He has achieved an impressive level of optical aberration correction, consistent with his other Ethos designs.

The eyepiece utilizes advanced coating techniques to maximize contrast and transmission. The internal mechanical design techniques, synonymous with all Tele Vue eyepieces, further enhance these features. The 21mm Ethos eyepiece pushes the boundaries of the 2" barrel and focus constraints, providing the maximum true field of view without significant vignetting at the field's edge. It is parfocal with the 31mm Nagler Type 5, offering seamless transitions between views.

The 21mm focal length completes the logical set of 21mm/13mm/8mm and complements the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm Ethos eyepiece has an effective field stop diameter of 36.2mm, bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). It also offers a larger true field 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, compared to 8.75mm with a 35mm Panoptic, or 6.5mm with a 26mm Nagler. Like all Tele Vue eyepieces, each 21mm Ethos undergoes rigorous optical and cosmetic quality control procedures in Chester, NY. Should your eyepiece ever require service, we can handle everything from replacing a dented barrel to a scratched eyelens.

All Ethos models accept Dioptrx, allowing you to compensate for your eyesight astigmatism with a high-quality multi-coated lens providing your exact correction, rotation orientation, and centration over the eyepiece. This is the culmination of our commitment to delivering observing experiences "even better than you imagined," and a 30-year recognition of being "tops in the field."

Tele Vue Ethos Features

  • 21mm Focal Length
  • 2" Diameter Barrel
  • Wide 100 Degree Field of View
  • Slip-Resistant Textured Surface
  • Fully Multi-Coated Optics
  • Fold-Down Rubber Eyecup

Key Features

  • Experience expansive views with the Tele Vue 21mm Ethos eyepiece's impressive 100° apparent field.
  • Enjoy comfortable observations with a generous 15mm eye relief, perfect for long stargazing sessions.
  • The 2" barrel size of this Tele Vue eyepiece ensures compatibility with a wide range of telescopes.
  • Weighing just 2.25 lbs, the 21mm Ethos eyepiece balances premium quality with manageable weight.
  • Achieve edge-to-edge sharpness with this 21mm eyepiece, delivering exceptional image quality.
  • Explore the night sky with confidence using the durable and high-performance Tele Vue Ethos eyepiece.

What's in the box:

  • Tele Vue Ethos 21mm Eyepiece (2.0")
  • Tele Vue Limited Lifetime Warranty