※ 引述《justdemon (人生的转捩点)》之铭言： : 最近深刻体会到感光元件大小的重要性 : 所以开始寻找大片幅的DC : 看啊看着 却觉得怎麽算都不太对劲 : 为什麽怎麽算对角线的长度都不如标示长度呢?! : 最後才惊为天人的发现 原来1" = 16mm ?! : 可是怎麽Google却都找不到原因 : 只看到一些跟CRT 圆取方之类的东西 : 就是没有告诉我为什麽1"=16mm啊.... : 不知道这边是否有前辈曾经研究过可以给小弟解答呢? : 感谢~ Dpreview上解释名词有大概说一下 http://www.dpreview.com/learn/?/Glossary/Camera_System/sensor_sizes_01.htm Sensors are often referred to with a "type" designation using imperial fractions such as 1/1.8" or 2/3" which are larger than the actual sensor diameters. The type designation harks back to a set of standard sizes given to TV camera tubes in the 50's. These sizes were typically 1/2", 2/3" etc. The size designation does not define the diagonal of the sensor area but rather the outer diameter of the long glass envelope of the tube. Engineers soon discovered that for various reasons the usable area of this imaging plane was approximately two thirds of the designated size. This designation has clearly stuck (although it should have been thrown out long ago). There appears to be no specific mathematical relationship between the diameter of the imaging circle and the sensor size, although it is always roughly two thirds. 反正看来是从电视阴极射线管之类的东西沿用过来的尺寸， 其实尺寸指的是射线管子外的玻璃套大小.... 标示尺寸会比实际大，大概就是2/3~ 英文不好，其他自己看吧XD --

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