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  2. 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]

  3. 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]

  4. Birkenstock opens at $41 a share in IPO debut, nearly 11% ...

    www.aol.com/finance/birkenstock-opens-41-share...

    Birkenstock stepped into the public market on Wednesday.Shares of the shoemaker debuted at $41 a share on the New York Stock Exchange under the ticker symbol "BIRK." The company priced shares on ...

  5. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    The first fixed lens to be constructed with toroidal prisms was a first-order apparatus designed by the Scottish engineer Alan Stevenson under the guidance of Léonor Fresnel, and fabricated by Isaac Cookson & Co. using French glass; it entered service at the Isle of May, Scotland, on 22 September 1836. [47]

  6. Fujinon - Wikipedia

    en.wikipedia.org/wiki/Fujinon

    300mm 1:9.0 (for 8×10 in). Image circle at f /22: 420mm; 360mm 1:10.0 (for 8×10 in). Image circle at f /22: 504mm; Fujinon C is a line of 4-element, 4-group compact lenses. 300mm 1:8.5 (for 8×10 in) 450mm 1:12.5 (for 11×14 in) 600mm 1:11.5 (for 14×17 in) Fujinon-L. 210mm 1:5.6; 300mm 1:5.6 . Image circle : 343mm; 420mm 1:8.0; Fujinon T is ...

  7. Canon EF 50mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_50mm_lens

    Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, [1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 [1] and its faster cousins adding additional elements. [2]

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