Petzval lens design 佩兹瓦尔透镜设计 The first portrait lens is invented by Viennese mathematician Joseph Max Petzval (1807 – 1891), it takes circular pictures. 第一个人像镜头是维也纳数学家约瑟夫·马克斯·佩兹瓦尔（1807-1891）发明的，拍摄的是圆形照片。 |
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