{"id":107527,"date":"2026-04-28T11:46:21","date_gmt":"2026-04-28T09:46:21","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107527"},"modified":"2026-08-23T15:07:14","modified_gmt":"2026-08-23T13:07:14","slug":"televue-ethos-8mm-eyepiece","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-ethos-8mm-oculair\/","title":{"rendered":"TeleVue Ethos 8mm \u2013 Eyepiece"},"content":{"rendered":"

TeleVue Ethos 8mm: Eyepiece: Ethos eyepiece with a 100-degree field of view<\/strong><\/h2>\n\n\n\n

The Ethos 8 mm is the lightest eyepiece in the series and is therefore best suited for use in a binocular viewer or on a mount with a low weight capacity. While its diameter remains modest, its field of view remains impressively large at 100 degrees.<\/p>\n\n\n\n

This focal length belongs to the series of 21 mm, 13 mm, and 8 mm and provides a high, yet comfortable magnification on most telescopes.<\/p>\n\n\n\n

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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<\/div>\n<\/div>\n\n\n\n

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Enough light for any setup<\/h4>\n\n\n\n

Weighing about 430 grams, the 8 mm merk is lighter than the longer models. On a Dobsonian, you hardly need to readjust the balance when changing eyepieces.<\/p>\n\n\n\n

In 1.25 inch mode, the eyepiece is parfocal with TeleVue Ploessls, DeLites, Nagler Type 6, and the 1.25 inch Panoptics. With the HiHat adapter, you maintain that parfocality even in a 2 inch focuser.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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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<\/div>\n<\/div>\n\n\n\n

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

In a telescope with a focal length of 1,200 mm, this eyepiece provides approximately 150x magnification with a true field of view of about 0.66 degrees. You can calculate this for your own telescope using the field stop: true field of view = 57.3 \u00d7 field stop divided by the telescope\u2019s focal length.<\/p>\n\n\n\n

The field stop on this model is 13.9 mm. That number\u2014not just the focal length\u2014determines how much of the sky you actually see.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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