All zoom, focus, and lens shift adjustments are manual.
所有的变焦，聚焦和镜头移动调整手册。
First we must find the focus of a lens.
首先我们需要找到透镜的焦点。
Focal length: The distance between the centre of a lens and its principal focus.
焦距：镜头中心与其主焦点的距离。
There are bad optical aberration in the camera lens of short focus.
短焦距摄像机镜头一般都存在比较严重的光学畸变。
Don't forget to focus the lens.
别忘了调节镜头的焦距。
这是个长焦距镜头。
焦距长底随透镜的厚度而变化。
There are bad optical aberration in the camera lens of short focus.
短焦距摄像机镜头一般都存在比较严重的光学畸变，使成像质量下降。
Don't forget to focus the lens.
照相机上对着图像调焦的镜头。
Don't forget to focus the lens.
照相机上对着图像调焦的镜头。
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