西门子545-797

西门子545-797

545-797 

所谓变焦，指的是镜头自身能够经过调理，使焦距有较大的改动规模(通常用焦距改动的倍数来衡量，例如4倍变焦指大焦距是小焦距的4倍)。这种镜头运用中，能够经过变焦，改动成像扩大倍率(在“大场景“和”部分特写“之间随意转换)，适应性强，运用规模很广。

变焦的完结方法：变焦进程中，经过光学体系中的两组(或更多)透镜相对移动，改动整个体系(镜头)的组合焦距，且一起确保像面方位不动，使图画扩大倍率改动并且成像一直明晰。

它与单组移动式调焦不一样的，单组移动式调焦意在改动成像面的方位(虽然也会引起镜头焦距的微小改动);而变焦意在改动镜头的焦距(通常都是数倍的改动)，它要求安稳像面不动。

545-797 

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