TeleVue Ethos 10mm 100° – Eyepiece

TeleVue Ethos 10mm 100°: Eyepiece: Ethos eyepiece with 100-degree field of view

The Ethos 10 mm is between the 13 mm and 8 mm, and is the midpoint of the 17, 10, and 6 mm series. For many telescopes, this is the focal length that most often remains in the focuser.

The combination of medium magnification and a 100-degree field of view works well for both globular clusters and galaxies, as well as moon details.

What a 100-degree field of view does

A classic Ploessl has 50 degrees, a Nagler has 82 degrees. At 100 degrees, your eye can no longer take in the field at once: you’re looking around the image instead of *at* it. That’s the effect the Ethos series is known for.

Practically, this also means that objects remain in view for longer. On a manually tracked Dobson, this saves constant readjustment.

A versatile mid-magnification

At this focal length, the exit pupil on most telescopes is between 1.5 and 2.5 mm. This is the range in which the eye resolves the most detail and the sky background is already quite dark.

For deep-sky objects that are just a bit too small for a 13mm and just a bit too large for an 8mm, this is the logical choice.

Viewing Comfort and Dioptrx

The eye relief is 15 mm at every focal length in the series. The height of the foldable eyecup is adjustable, so your eye is always in the same position.

If you wear glasses due to astigmatism, you can replace them with Dioptrx on the eyepiece. This corrects your own cylindrical aberration without the eyeglass lenses costing contrast and eye distance.

In your telescope

In a telescope with a focal length of 1200 mm, this eyepiece provides approximately 120x magnification with a true field of view of about 0.84 degrees. You can calculate this for your own telescope using the field stop: true field of view = 57.3 x field stop divided by the telescope's focal length.

The field stop of this model is 17.6 mm. That number, not just the focal length, determines how much of the sky you're actually seeing.

Included

• Foldable rubber eyecup
• Eyecup protector
• Dust cover for the stitch
• Filter thread abandoned

Featured accessories

Every Ethos eyepiece is compatible with the TeleVue Dioptrx, a corrector for astigmatism that allows you to observe without glasses. If you’re using a fast Newtonian, the Paracorr coma corrector will bring out that last bit of edge sharpness. For a 2-inch focuser, an Everbrite zenith mirror is the logical addition, and an eyepiece case protects your investment while on the go.

For whom yes and for whom no

• ✓ Nebulae, galaxies, and planetary nebulae
• ✓ Highly detailed moon observations
• ✓ How to build a 17, 10, and 6 mm series
• ✗ Wide-field observations of large nebular complexes
• ✗ For those looking for the lightest possible eyepiece

Specifications

All wide-angle eyepieces are on the page featuring wide-field eyepieces. You can find the complete selection of this merk on the TeleVue merk Page.