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  2. Televue - Wikipedia

    en.wikipedia.org/wiki/Televue

    At the North East Astronomy Forum 2010, they revealed the Ethos SX, a 3.7mm focal length eyepiece with an even greater 110° apparent field-of-view. [3] In 2011, a new line of eyepieces was introduced called the Delos. These eyepieces are based on the Ethos but have a smaller field of view of 72°. Instead, they boast a comfortable 20mm eye relief.

  3. Binoviewer - Wikipedia

    en.wikipedia.org/wiki/Binoviewer

    1 - Eyepiece 2 - Compensation slide 3 - Prism 4 - Beam splitter 5 - Body 6 - Barlow lens. In contrast to binoculars, ...

  4. Eye relief - Wikipedia

    en.wikipedia.org/wiki/Eye_relief

    For example, a 10 × 42 binocular has a 4.2 mm wide exit cone, and fairly comfortable for general use, whereas doubling the magnification with a zoom feature to 20 × results in a much more critical 2.1 mm exit cone. Optics showing eye relief and exit pupil 1 Real image 2 Field diaphragm 3 Eye relief 4 Exit pupil

  5. The best gifts for all kinds of dads in 2024 - AOL

    www.aol.com/lifestyle/best-gifts-dads-195639570.html

    Updated December 11, 2024 at 2:56 PM The best gifts for all kinds of dads in 2024 Dads tend to have the most fun hobbies — fishing , golfing, bird watching , and, if you're my father-in-law ...

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  7. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    In addition, one of the two eyepieces can be further adjusted to compensate for differences between the viewer's eyes (usually by rotating the eyepiece in its mount). Because the focal change effected by the adjustable eyepiece can be measured in the customary unit of refractive power, the dioptre , the adjustable eyepiece itself is often ...

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