焦距数字越大(以毫米表示)，放大倍数越高。
The larger the number (measured in millimeters), the higher the magnification.
这在任何光圈和焦距上都适用，只不过光圈越小、焦距越短，景深越大，你能够拍摄的清晰长度就越大。
This works for all apertures and focal lengths, but the smaller the aperture and the shorter the focal length, and the greater the distance you shoot at, the greater the depth of field.
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