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一、问题的提出 大家知道变焦距镜头就是焦距可以连续变化(或不连续变化)而保持画幅大小和成象清晰度不变的镜头。移动部分透镜实现焦距变化的想法早在1902年就提出来了。但真正实现这样的镜头那还是1931年巴利奥古劳卡(Variogro-wear)设计的16毫米电影变焦距镜头。用变焦距镜头摄影的胶片放映后产生了较高的艺术效果和真实感。从此变焦距镜头首先用于16毫米和35毫米电影。第二次世界大战后,变焦距镜头开始用于电视摄象,因变焦距镜头对电视中随时插入的各种大小不同的图象和解说词卡片的显示特别灵活方便,使得变焦距镜头在电视中的应用比在电影方面更为广泛。1970年以后各种
First, the problem put forward We all know that zoom lens is the focus can be continuous change (or discontinuous changes) while maintaining the frame size and definition of the same image. The idea of moving part of the lens to achieve focal length changes was introduced back in 1902. But the real shot is that of the 1931 Variogro-wear 16mm movie zoom lens. A film with a zoom lens shows a high artistic effect and realism. Since then the zoom lens is first used for 16 mm and 35 mm movies. After the Second World War, the zoom lens began to be used for television camera, zoom lens on the TV at any time into the various sizes of images and commentary card display is particularly flexible and convenient, making the zoom lens in the television In the application of more than in the film. After 1970 various