Tele Vue Ethos 21mm Eyepiece (2.0")

Tele Vue Ethos 21mm Eyepiece (2.0")

Tele Vue Ethos 21mm Eyepiece (2.0")

B&H # TEEP21E MFR # ETH-21.0
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Product Highlights

  • 21mm Focal Length
  • Wide 100° Field of View
  • 2" Diameter Barrel
  • Fully Multi-Coated Optics
  • Slip-Resistant Textured Surface
  • Fold-Down Rubber Eyecup
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  • 1Description

With its exceptional apparent angle of view, the Tele Vue Ethos 21mm Eyepiece offers a comfortable eye-relief with high contrast and excellent on-axis sharpness; and virtually zero astigmatism or field curvature across its expansive 100° field of view.

It features anti-reflection fully multi-coated optics to improve brightness, color rendition, and contrast; and a fold-down rubber eyecup that helps to block stray peripheral light from interfering with the views and to further enhance contrast. Combining a hyper-wide apparent angle of view with a long focal length, the eyepiece delivers moderate to low magnifications on most telescopes — offering expansive views of the night sky and an immersive observational experience. This eyepiece features a large 2" barrel diameter to make it even more comfortable to view through, and a textured rubberized grip for sure handling. It is compatible with the astigmatism-correcting DIOPTRX diopters to further improve the view.

In the Box
Tele Vue Ethos 21mm Eyepiece (2.0")
  • Limited Lifetime Warranty
  • Table of Contents
    • 1Description
    Focal Length 21.0mm
    Barrel Diameter 2.0"
    Eye Relief 15 mm
    Field Stop Diameter 36.2 mm
    Apparent Field of View 100°
    Dimensions 4.3 x 3.0" / 10.9 x 7.5 cm
    Weight 36.0 oz / 1020.6 g
    Packaging Info
    Package Weight 3.0 lb
    Box Dimensions (LxWxH) 8.3 x 4.3 x 4.25"
    Ethos 21mm Eyepiece (2.0") is rated 5.0 out of 5 by 3.
    Rated 5 out of 5 by from Worth every Penny!!! 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!
    Date published: 2010-11-19
    Rated 5 out of 5 by from Fantastic viewing 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!
    Date published: 2014-02-03
    Rated 5 out of 5 by from Ethos 21 mm: Definitely Worth the Price! 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.
    Date published: 2011-08-15
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