---
product_id: 8158460
title: "Tele Vue 21mm Ethos 2\" Eyepiece"
brand: "tele vue"
price: "¥290495"
currency: JPY
in_stock: true
reviews_count: 7
url: https://www.desertcart.jp/products/8158460-tele-vue-21mm-ethos-2-eyepiece
store_origin: JP
region: Japan
---

# Apparent Field: 100° # of Lens Elements: 6 Focal Length: 21mm Tele Vue 21mm Ethos 2" Eyepiece

**Brand:** tele vue
**Price:** ¥290495
**Availability:** ✅ In Stock

## Summary

> 🌠 See the Universe Like Never Before!

## Quick Answers

- **What is this?** Tele Vue 21mm Ethos 2" Eyepiece by tele vue
- **How much does it cost?** ¥290495 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/8158460-tele-vue-21mm-ethos-2-eyepiece)

## Best For

- tele vue enthusiasts

## Why This Product

- Trusted tele vue brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Premium Quality:** Elevate your astronomy game with Tele Vue's renowned craftsmanship.
- • **Unmatched Clarity:** Experience celestial wonders with a 100° apparent field of view.
- • **Comfortable Viewing:** Enjoy extended stargazing sessions with 15mm of eye relief.
- • **Wide Field of Vision:** Explore the universe like never before with a 36.2mm field stop diameter.
- • **Precision Engineering:** Crafted with 6 lens elements for stunning image quality.

## Overview

The Tele Vue 21mm Ethos 2" Eyepiece is a high-performance astronomical accessory designed for serious stargazers. With a focal length of 21mm, a remarkable 100° apparent field of view, and 15mm of eye relief, this eyepiece offers unparalleled comfort and clarity. Its precision-engineered 6 lens elements ensure stunning image quality, making it a must-have for any astronomy enthusiast.

## Description

Tele Vue 21mm Ethos 2" Eyepiece

## Features

- Focal Length: 21mm
- # of Lens Elements:
- Apparent Field: 100°
- Eye Relief: 15mm
- Field Stop Diameter: 36.2mm

## Product Details

- **Brand:** Tele Vue
- **Focal Length Description:** 21 mm
- **Lens Type:** Standard
- **Compatible Mountings:** C Mount
- **Camera Lens Description:** 21 millimetres

## Images

![Tele Vue 21mm Ethos 2" Eyepiece - Image 1](https://m.media-amazon.com/images/I/51aG4j8OPwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Superb eyepiece
*by V***L on October 14, 2019*

This is a wonderful eyepiece - no doubt. Optically close to perfect, this line of eyepieces allows you to similarly frame a DSO like a cluster or a galaxy at 2X the magnification that you'd get using a Plossl i.e. to frame a DSO the same way with a Plossl as this eyepiece, you'd have to use a 42mm Plossl. In the Ethos, the object would appear 2X as large. With sufficient aperture, you increase your chances of actually seeing the same DSO because even though the DSO is 4X fainter as compared to the 41mm Plossl, contrast is unchanged and at the large angle subtended by the object, your eye might succeed in detecting the object even if its undetectable with the 41mm Plossl in the same telescope. Look into the material presented in Roger Clark's Visual Astronomy of the Night Sky for a more detailed explanation of what I'm saying here...Specific to this eyepiece is the gargantuan weight of ~ 2.2 lbs!! Make sure that your focuser is able to handle the weight. You may have to upgrade focusers to prevent the eyepiece from slipping when focusing at targets close to the horizon.A second point to consider is the utility of this eyepiece. In my f/5.9 8" dob, I get a true FOV of 1.75 degrees! This means that this eyepiece is great for rich-field work, but perhaps a little too wide to appreciate smaller objects. For example, the ring nebula at 0.064 degrees is very small indeed in this monster! Consider pairing this eyepiece with a few shorter focal length eyepieces - a full set of the 13mm, 8mm, and 6mm Ethos complement this eyepiece nicely!

### ⭐⭐⭐⭐⭐ Quality for a price
*by J***F on September 10, 2023*

This eyepiece has a large field of view for the magnification it provides. I can fit the Perseus "Double Cluster" inside the same field of view in an 18" F4.5 Dobsonian. It offers reasonable magnification with incredible optical quality. Stars are dots to the edge of the field when I use a TeleVue ParaCorr. 21mm allows for great views when seeing isn't quite perfect. I plan to buy a 13mm Ethos for nights that will allow a bit more power. Globulars and planets especially love it.

### ⭐⭐⭐⭐⭐ Absolute Quality
*by R***A on September 26, 2021*

Truly the best quality eye piece available bar none.

## Frequently Bought Together

- Tele Vue 21mm Ethos 2" Eyepiece
- Celestron LensPen - Optics Cleaning Tool, Black (93575)
- Astromania Anti-Vibration Suppression Pads Telescope Mounts - for Vibration-Free observing

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-14*