Keep in mind that changing focal length will require refocusing in most zoom lenses.
要注意的是，对于大多数变焦镜头来说，焦距改变了，就得重新对焦。
The reason for this is that as we know, longer focal length lenses magnify the image, but they also magnify the camera shake.
正如我们前面所学，更长的镜头焦距虽然放大了图像，但同样增加了镜头抖动。
Camera lenses have two general attributes: f-stop and focal length.
照相机镜头有两项一般属性：f制光圈和焦距。
Two lenses of focal length 10 cm have a combined focal length of 5 cm.
两个焦距都是10厘米的透镜形成的组合透镜焦距为5厘米。
Focal length is one of the most important optical characteristic parameter of optical lenses and optical instruments.
焦距是光学透镜和光学仪器的重要光学特性参数。
The authors have reported two methods for measuring the efficient focal distance of the laser rod lenses.
提出几种计算和测量激光棒负透镜等效焦距的方法。
The compound microscope consists of two convex lenses with short focal length, the objective and eyepiece lenses, fitted at opposite ends of a tube.
复合显微镜包括两个短焦距凸透镜，即位于镜筒两端的物镜和目镜。
If you wish to photograph the moon retaining as much detail as possible with a minimum of cropping to fill the frame, you need lenses with a long focal length.
如果你想拍摄月球保留尽可能多的细节用最少的种植来构图，镜头的焦距。
An accurate method for measuring the focal lengths of the pulse pump-induced lenses in laser media is presented and discussed.
提出脉冲激光工作物质热焦距的精确测量方法，并对其进行了讨论。
The course covers fundamental concepts that apply to any camera, such as focal length and camera position, and shows how to evaluate and shop for DSLR lenses.
本教程涵盖了适用于任何相机的基本概念，比如镜头的焦距和摄影机的位置。
The course covers fundamental concepts that apply to any camera, such as focal length and camera position, and shows how to evaluate and shop for DSLR lenses.
本教程涵盖了适用于任何相机的基本概念，比如镜头的焦距和摄影机的位置。
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