At a Glance
10mm
Focal Length
100°
Apparent FOV
15mm
Eye Relief
1.25"
Barrel Size
Score Breakdown
Overview
The Tele Vue Ethos 10mm is one of the most respected wide-field eyepieces available to amateur astronomers, and for good reason. Its 100-degree apparent field of view is not a marketing number but a genuinely transformative experience, especially when sweeping through star clusters, nebulae, or the Milky Way. Compared to the already-generous 82-degree Naglers, you get roughly 50% more visible area, which translates to a noticeably more immersive, almost spacewalk-like sensation at the eyepiece.
The 15mm of eye relief makes extended observing sessions comfortable, and eyeglass wearers will find it usable without removing their glasses. The dual 2-inch and 1.25-inch compatibility means this eyepiece will work with most telescopes you are likely to own or upgrade to. At $745, this is a serious investment, and it is worth being clear that the optical quality will only shine when paired with a telescope capable of supporting it.
On a fast reflector or refractor, some edge-of-field softness can appear, though the center performance is consistently excellent. With only 9 Amazon reviews, community feedback is limited, but the Ethos line has a long-standing reputation among experienced observers as a benchmark product.
Key Features
- 100-degree apparent field provides a uniquely immersive view, noticeably wider than standard wide-angle eyepieces
- 15mm eye relief supports comfortable viewing for eyeglass wearers during long sessions
- Compatible with both 2-inch and 1.25-inch focusers, covering most telescope configurations
- DIOPTRX compatibility allows astigmatism correction without removing prescription glasses
- 17.7mm field stop is optimized to maximize the usable field at the focal plane
- Fully multi-coated optics support high contrast and light transmission across the field
- A significant but long-term investment, best suited for observers committed to serious visual astronomy
Specifications
| Focal Length | 10mm |
| Apparent FOV | 100° |
| Eye Relief | 15mm |
| Barrel Size | 1.25" |
| Design | Modified Nagler |
| Elements/Groups | 9/6 |
| Series | Ethos |
| Coating | Fully Multi-Coated |
| Waterproof | No |
Popular Telescopes for This Eyepiece
Sky-Watcher FlexTube 300 SynScan
150x / 2.0mm exit pupil / Dobsonian
Celestron NexStar 130SLT
65x / 2.0mm exit pupil / Newtonian
Sky-Watcher FlexTube 300P
150x / 2.0mm exit pupil / Dobsonian
Unistellar eVscope Equinox
45x / 2.5mm exit pupil
Amazon Reviews
This 10 mm eyepiece is the pride and joy of my eyepieces for my 8 inch SCT telescope. Great quality, crisp views, the expense is definitely worth it. Good job Televue and Agena Astro!
This is my fourth Ethos eye piece and not one flaw on any of them on arrival. The eye relief is a little tricky but the payoff of a clear high contrast 100 degree view more than makes that worth while. Expensive ? Yes, but relative to the views worth it … you need to own a few of these ! The anchor ...
I gave this eyepiece 3 stars. I REALLY REALLY wanted to be able to give it 5 stars and say that it was the best money I ever spent. But the truth is, I have mixed feelings about it. To start with the positives, this eyepiece lives up to the hype in the sense that it has a magnificent field of view. ...
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