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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]
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.
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]
These lenses are 8 elements in 6 groups, and have an angle of view of 105°. 65mm 1:5.6 (for 4×5 in) 75mm 1:5.6; 90mm 1:5.6 (for 5×7 in) Fujinon SW is a 6-element, 6-group line, with an angle of view of 100°. 90mm 1:8.0 (for 4×5 in) 105mm 1:8.0 (for 5×7 in) 120mm 1:8.0; 125mm 1:8.0; Fujinon-W. 125mm 1:5.6; 135mm 1:5.6; 150mm 1:5.6; 150mm 1 ...
A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
The sequence of lens designations may differ in literature. See also full list of Nikon designations, Sigma designations, Tamron designations and Tokina designations.. Nikon AF-S/Sigma HSM/Tamron USD or PZD: The lens contains an integrated ultrasonic focus motor based on piezoelectricity, which enables quiet or low noise autofocus operation.
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