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Wollensak was an American manufacturer of audio-visual products. At the height of their popularity in the 1950s and 1960s, many brands of movie cameras came with a Wollensak Velostigmat lens. Wollensak reel-to-reel tape recorders were prized for their robust construction and value. In the 1960s, Wollensak was the choice tape recorder for amateur home, school, and office uses. They were produced in both stereo and mono designs. The firm was founded in 1899 by Andrew Wollensak to produce camera shutters. At its peak in the 1950s, it employed over a thousand people. The company had several owners, including Revere Camera Company and 3M Company. Wollensak ceased operation in 1972. ==Camera equipment== Wollensak began making camera lenses in 1902. The company also produced camera shutters for large format cameras. They made shutters such as the Betax, Alphax, Optimo and, for the Graflex Corporation, Rapax. The Betax shutters were patented in 1912 and remain popular for large format photographers today. Betax shutters are made in different sizes from size #0 to the huge size #5. These shutters are very reliable and relatively easy to repair. Wollensak purchased the Fastax high speed rotating-prism camera developed by Bell Labs from Western Electric, and developed it to a capability of 10,000 frame/s,. Fastax cameras were used for recording projectiles and explosions, including nuclear explosions. The cameras, with the rotating prism removed, were often used for "streak" and "smear" photography. see High speed photography. Wollensak only ever made one still camera, the "Stereo 10" 35 mm 3D Camera 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wollensak」の詳細全文を読む スポンサード リンク
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