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首先介绍一下镜头的相关知识。镜头应用主要有三个方面:第一是新闻制作,新闻制作摄像机一般用的是比较小型的摄像机以方便使用和快速拍摄新闻,这种摄像机一般使用的是内置镜头以做到小型化和坚固性,这种镜头具备变焦的功能,所有功能都是通过内置镜头实现的。第二就是数字摄影机,数字摄影机成像器件是35毫米的器件,它一般使用专门用于35毫米的定焦镜头,也有数量不多的变焦镜头,不过这种变焦镜头的变焦比都很小,大约3倍左右,而且这种定焦镜头是比较昂贵的。第三是广播级摄像机,这种摄像机使用的是配合2/3英寸成像器件的镜头,采用B4卡口,这种镜头的最大特点是技术成熟,变焦范围
First introduce the relevant knowledge of the lens. There are three main lens applications: The first is the news production, news production cameras are generally used is a relatively small camera to facilitate the use and rapid shooting of news, this camera is generally used is built-in lens to be small and rugged, This lens has a zoom function, all with built-in lens. The second is the digital camera, digital camera imaging device is a 35 mm device, which generally used specifically for 35 mm fixed focus lens, there are a small number of zoom lenses, but this zoom lens zoom ratio is very small, about 3 times, and this fixed-focus lens is more expensive. The third is a broadcast camera, this camera uses a 2/3 inch imaging device with the lens, the B4 mount, the most prominent feature of this lens is the technology is mature, the zoom range