佩兹伐人像镜头是最早的数学计算镜头。

The Petzval's portrait lens is the first mathematically calculated lens.

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后来随着像佩兹伐肖像镜头这样的“快镜头”（最初的数学计算镜头之一）的应用这“长时间”才得以缩短。

The time was later reduced with the "faster" lenses such as the Petzval's portrait lens, the first mathematically calculated lens.

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