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  2. AN-6530 goggles - Wikipedia

    en.wikipedia.org/wiki/AN-6530_goggles

    AN-6530 lenses are ground and polished optical glass, approximately 3 ⁄ 32 of an inch (2.4 mm) thick. These share their design with B-7, Navy Mk-II and commercial 'Skyway' brand goggles. They were produced in clear, amber, green, and a high-density dark green for gunnery to facilitate spotting targets against the sun.

  3. Birkenstock - Wikipedia

    en.wikipedia.org/wiki/Birkenstock

    Birkenstock was neither an ideologically convinced National Socialist nor a hero. Even though he wanted to do something good for mankind with his healthy footwear, his dealings with individuals were robust. [20] [9] After World War II (1939–1945), the Birkenstock sandal was popular among returning soldiers because of the orthopedic support. [21]

  4. Aviator sunglasses - Wikipedia

    en.wikipedia.org/wiki/Aviator_sunglasses

    The AN6531 Comfort Cable aviator sunglasses frame kept being issued by the U.S. military as No. MIL-G-6250 glasses after World War II with different lenses as Type F-2 (arctic) and Type G-2 aviator sunglasses but fitted with darker lenses until their substitute the Type HGU-4/P aviator sunglasses became available in the late 1950s. [6] [7] [8]

  5. America's Best Contacts & Eyeglasses - Wikipedia

    en.wikipedia.org/wiki/America's_Best_Contacts...

    America's Best Contacts & Eyeglasses is a discount provider of eye examinations, eyeglasses and contact lenses, with over 1000 retail locations in the United States as of May 31, 2024. The millennial store is located in Philadelphia, PA, which happened to be one of National Vision's first markets in their early days over 40 years ago.

  6. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    They began breaking new ground around 1960: the Nippon Kogaku Auto-Nikkor 8.5–25 cm f/4-4.5 (1959), for the Nikon F, was the first telephoto zoom lens for 35mm still cameras (and second zoom after the Zoomar), [141] the Canon 50mm f/0.95 (1961), for the Canon 7 35mm RF, with its superwide aperture, was the first Japanese lens a photographer ...

  7. Optical aberration - Wikipedia

    en.wikipedia.org/wiki/Optical_aberration

    [8] The aberrations of the third order are: (1) aberration of the axis point; (2) aberration of points whose distance from the axis is very small, less than of the third order — the deviation from the sine condition and coma here fall together in one class; (3) astigmatism; (4) curvature of the field; (5) distortion. [8]

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