At a Glance
13mm
Focal Length
100°
Apparent FOV
15mm
Eye Relief
1.25"
Barrel Size
Score Breakdown
Overview
The Tele Vue Ethos 13mm is one of the most respected eyepieces in amateur astronomy, and for good reason. Its 100-degree apparent field of view creates an immersive, spacewalk-like experience that narrower eyepieces simply cannot match. At 13mm, it sits in a versatile sweet spot, delivering enough magnification for detailed views of nebulae, star clusters, and galaxies while keeping a generous true field of view in most telescopes.
The 22.3mm field stop is among the largest you will find in a 2-inch barrel, and the 15mm of eye relief makes extended observing sessions comfortable, including for eyeglass wearers. It also accepts Tele Vue's DIOPTRX astigmatism corrector, which is a practical advantage for observers who struggle with edge sharpness due to uncorrected astigmatism. Tele Vue designed this eyepiece specifically to control astigmatism, field curvature, and lateral color across the full field, which means stars stay tight from center to edge.
The dual 2-inch and 1.25-inch barrel compatibility adds flexibility across different telescope focusers. At over $800, this is a serious investment. But the build quality, optical performance, and near-perfect Amazon rating from experienced users suggest it delivers on its promise for observers who want the best wide-field experience available.
Key Features
- 100-degree apparent field of view creates an unusually immersive, full-sky viewing experience
- 13mm focal length suits a wide range of targets, from open clusters to extended nebulae
- 15mm eye relief allows comfortable viewing, with support for the DIOPTRX astigmatism corrector
- Corrected optics maintain sharpness and star quality from the center to the outer edge of the field
- Dual 2-inch and 1.25-inch barrel fits most telescope focusers without adapters
- Fully multi-coated optics support high contrast and minimal light loss across all wavelengths
- Premium build from Tele Vue reflects decades of in-house optical design expertise
Specifications
| Focal Length | 13mm |
| 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
115x / 2.7mm exit pupil / Dobsonian
Celestron NexStar 130SLT
50x / 2.6mm exit pupil / Newtonian
Sky-Watcher FlexTube 300P
115x / 2.7mm exit pupil / Dobsonian
Celestron 114LCM
77x / 1.5mm exit pupil / Newtonian
Amazon Reviews
This is a wonderful eyepiece! 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 26mm Plossl. In t...
I am relatively new to the telescope hobby and was not sure whether I should spend this kind of money on a single eyepiece despite all the great things I'd read about the Tele Vue line. After a great deal of rationalization, I purchased my first Ethos and will be buying my second one shortly. I don'...
I didn't love the price! But this is a truly Awesome eyepiece, combined with a televue 4X barlow my 12.5" reflector gets about all the magnification it can. I bought it for the 2020 conjunction, given the price I was not sure I was going to keep it when Jupiter and Saturn had drifted back apart. Whe...
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