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Sometimes they are fraudulently advertised as "infrared" binoculars. Because a typical binocular has 6 to 10 optical elements [52] with special characteristics and up to 20 atmosphere-to-glass surfaces, binocular manufacturers use different types of optical coatings for technical reasons and to improve the image they produce. Lens and prism ...
In addition to the more stereotypical binocular type, folding opera glasses were another common design. They were made mostly of metal and glass, with a leatherette cover for grip and color. Although folding glasses have existed in one form or another since the 1890s, [ 2 ] they were perhaps most popular in the mid-20th century and many from ...
The early writers discussed here treated vision more as a geometrical than as a physical, physiological, or psychological problem. The first known author of a treatise on geometrical optics was the geometer Euclid (c. 325 BC–265 BC).
I was 6 years old when I received the Christmas toy that would change the entire course of my life and career. I had discovered it in a catalog and ogled it in the store, begging my parents for it ...
Synta is a manufacturer of astronomy equipment and related components and at that time had been a supplier for Celestron for over 15 years. [5] On March 13, 2012, Tom Johnson died at the age of 89. [3] [6]
Wray also made aerial reconnaissance lenses. Their 36" f /6.3 is particularly good but has some residual spherical aberration at full aperture. They also made a highly distortion-free 36" f /4 for mapping. This can only be used with an orange filter and orthochromatic film to avoid the residual secondary spectrum (chromatic aberration).
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