一个镜头的基础定义是其焦距，图4图示出镜头焦距，视野，感应器大小，和工作距离间之关系。
A lens is primarily defined by its focal length. Figure 4 illustrates the relationship between the focal length of the lens, field of view, sensor size, and working distance.
如果你知道视野FOV，感应器大小，和工作距离，你能用以下之方程序去计算你所需之镜头的焦距。
If you know the FOV, sensor size, and working distance, you can compute the focal length of the lens you need using the following formula.
从5月到9月，卢卡和其他潜水员在距离意大利诺里海岸150英尺的地中海奈莫花园工作。
From May through September, Luca and other divers are working on Nemo's Garden in the Mediterranean Sea, 150 feet from the coast of Noli, Italy.
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