{"id":107545,"date":"2026-04-28T12:14:33","date_gmt":"2026-04-28T10:14:33","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107545"},"modified":"2026-07-20T12:26:19","modified_gmt":"2026-07-20T10:26:19","slug":"televue-ethos-10mm-100-eyepiece","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-ethos-10mm-100-oculair\/","title":{"rendered":"TeleVue Ethos 10mm 100\u00b0 \u2013 Eyepiece"},"content":{"rendered":"

TeleVue Ethos 10mm 100\u00b0: Eyepiece: Ethos eyepiece with 100-degree field of view<\/strong><\/h2>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

\"TeleVue<\/figure><\/figure>\n\n\n\n

What a 100-degree field of view does<\/h4>\n\n\n\n

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\u2019re looking around the image instead of *at* it. That\u2019s the effect the Ethos series is known for.<\/p>\n\n\n\n

Practically, this also means that objects remain in view for longer. On a manually tracked Dobson, this saves constant readjustment.<\/p>\n\n\n\n

A versatile mid-magnification<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

Viewing Comfort and Dioptrx<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

In your telescope<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

Included<\/h3>\n\n\n\n