使用变焦镜头的成像在各焦点范围内会发生各种变化。广角端可以扩大拍摄范围,远摄端可以放大被摄体,即使拍摄者不移动也可以自由地改变拍摄范围。这种变化在摄影术语中被称为“变焦倍率”,相机的产品说明书上也会注明其数值。
它提供了更广泛的角度捕捉以及高倍率变焦,逐步改变了对图像传感器的图像采集区。
It provides wider Angle capture as well as higher magnification zoom, by progressively changing the image capture area on the image sensor.
这种变焦距物镜有两个优点,一是可以实现高倍率变焦,二是容易消除在变焦过程中产生的像点移动现象。
Firstly, the zoom ratio may be enlarged. Secondly, the image point movement may be easily eliminated. The principle of optical compensated step zoom lens is explained.
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