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Tele Vue Ethos 21mm Eyepiece (2")

B&H # TEEP21E Mfr # ETH-21.0
In Stock
Free Expedited Shipping
You Pay: $799.00
Product Highlights
  • Barrel size: 2.0"
  • 100° AFOV

With its 100° on-axis FOV, the 2" diameter barrel Ethos 21mm Eyepiece from Tele Vue puts you deep 'inside' the 'final-frontier'. Intimate views of larger deep-sky objects and lush star fields are now a possibility. The Ethos eyepiece offers an extremely dimensional viewing experience that's sharp from edge-to-edge, and rich with detail revealing clarity.

The optical performance of the Ethos 21mm features an enhanced level of aberration correction along with technologically-advanced coating techniques and materials. The resulting increase in contrast and light-transmission is enhanced further by the Ethos' superior optical formula and internal mechanical design. This remarkable ocular extends the FOV to the limits of the 2.0" diameter barrel, yet it is free from significant vignetting.

The Ethos 21mm is a logical choice for owners of the 8mm and 13mm eyepieces. It also fits nicely into a 6/10/17mm set. The addition of the 21mm focal length into either line-up offers a 3.0x field area gain.

Optical
Eye relief: 15 mm
Parfocal with the 31 mm Nagler type 5
Effective field-stop diameter: 36.2 mm
Accepts Dioptrix astigmatism correctors
Focal Length 21 mm
Barrel Diameter 2.0"
Eye Relief 15 mm
Field Stop Diameter 36.2 mm
Apparent Field of View 100°
Dimensions Not specified by manufacturer
Weight 35.2 oz / 2.2 lb / 998 g

REVIEW SNAPSHOT®

by PowerReviews
Tele VueEthos 21mm Eyepiece (2")
 
5.0

(based on 3 reviews)

Ratings Distribution

  • 5 Stars

     

    (3)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

    Cons

      Best Uses

      • Astronomy (3)

      Reviewed by 3 customers

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      Displaying reviews 1-3

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      5.0

      Fantastic viewing

      By Stargazer on Long Island

      from Long Island, NY

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Easy To Use
      • Good Padding
      • Great Optics
      • Strong Construction
      • Widely Compatible Adapter

      Cons

        Best Uses

        • Astronomy

        Comments about Tele Vue Ethos 21mm Eyepiece (2"):

        Use for stargazing, when I want to see a wide field of view with details. Crisp, clear details across the image, no distortion near edge. I have an astigmatism, and even without using a corrector it's great. Tested it on the full Moon with my Meade SCT 10" and it was a beautiful sight, lots of details, didn't constantly need to adjust focus. A general sweep of the sky produced pinpoint stars. Looking forward to using it for everything to see what it's best for. Wish for clear skies!

        • Was this a gift?:
        • Yes

        Share this review

        (1 of 1 customers found this review helpful)

         
        5.0

        Ethos 21 mm: Definitely Worth the Price!

        By Bob

        from Poughquag, NY

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Great Optics

        Cons

          Best Uses

          • Astronomy

          Comments about Tele Vue Ethos 21mm Eyepiece (2"):

          The Ethos 21 mm is a Christmas gift. However, it arrived in August. I told my wife that I should probably check it out before Christmas (in case it was damaged - ha ha). I opened the box and stared in awe at how beautiful it was. Lucky for me, it was going to be a clear night.

          When night time descended upon us, we both wanted to check out the Ethos 21 mm. I also own a 31 mm Nagler T5. The Ethos 21 mm is parfocal with the 31. I pointed the telescope at M13 (the Great Globular Cluster in Hercules) with the 31 in place. This alone blows you away. I then swapped in the Ethos 21 mm.

          I could not believe it. Stunning. I was speechless. First the magnifcation went from 95 to 140 (I have an F/8 14.5 inch RC). And even though the true field went from .82 to .70, the apparent field increasing from 82 to 100 was phenomenal.

          When TeleVue advertises that you will "space walk" with this eyepiece, they are not kidding. The star field was expansive. You literally had to move your head around to take in the entire field. I felt like I fell into my telescope and was floating in space. M13 never looked so brilliant.

          The stars were pin points to the edge of the field. It is simply unbelievable.

          I had to continue to check the eyepiece out seeing that once the "test" was over, I wouldn't see it until Christmas. I can not wait until Christmas this year.

          Sure, the Ethos 21 mm is expensive. But it is worth the price. Highly recommended.

          • Was this a gift?:
          • Yes

          Share this review

          (2 of 2 customers found this review helpful)

           
          5.0

          Worth every Penny!!!

          By gharmany

          from Boise, ID

          Verified Buyer

          Pros

          • Quality Lenses
          • Strong Construction

          Cons

          • Heavy

          Best Uses

          • Astronomy

          Comments about Tele Vue Ethos 21mm Eyepiece (2"):

          I wasn't sure after seeing the price if this eyepiece was worth it or not, but after using it in my 10" reflector and a 25" dobsonian, I was speechless!!! (Luckily I had the chance to try it out before I bought it.) Everything I've viewed from M42 to faint galaxies, is as though I'm really viewing them for the first time, (and I work at an observatory). Greater magnification with tons of true field to fit large objects greatly improves contrast and details. I have no problem seeing the whole field of view, though it is very large, and it gives you a the sense that you can reach out and touch the objects you are looking at. Highly recommended!

          • Was this a gift?:
          • No

          Share this review

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