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Home » OBSERVATION » ASTRONOMY » ASTRONOMY ACCESSORIES » EYEPIECES AND BARLOW

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ETHOS EYEPIECE
ETHOS EYEPIECE
Observers have long sung the praises of low-power, wide-field views of the heavens. But that's misleading. Wide-field views are spectacular, but "low-power" got there because years ago only low-power eyepieces could show a wide field. In reality, higher magnification always provides a darker sky background, shows fainter stars, and delivers better resolution. Experienced observers usually select the highest magnification eyepiece that still has enough field of view to encompass their target. Enter Tele Vue's Ethos, the first astronomical eyepiece with 100° apparent field of view. For a given magnification, it shows 50% more sky than the previous widest-field oculars. You can read all the details of this remarkable eyepiece in our review in last
13-mm Ethos (left) and 26-mm Plössl (right) have same true field of the Double Cluster. But Ethos has twice the power factor and four times the contrast factor. Ethos therefore has a Majesty Factor of eight relative to the Plössl's Majesty Factor of one. For reference, the 0.9° true field shown could be produced by a 14" f/4 telescope using the 100° Ethos at 109x with a 3.2mm exit pupil or the 26-mm 50° Plössl at 55x with a 6.5mm exit pupil.
 
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Price: $764.95

 
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