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    Lens (optics) WikipediaA lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent ...Aspheric

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    Lens (optics) WikipediaA lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent ...Aspheric

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    History of the single-lens reflex camera WikipediaThe history of the single-lens reflex camera (SLR) begins with the use of a reflex mirror in a camera obscura described in 1676, but it took a

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    12 Tips for Improving Welding Safety MillerWeldsBest welding safety practices and equipment are universally applicable. Welding exposes everyone to similar hazards, whether you're responsible f

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