作者knanda (小安安)
看板DC
标题Re: [问题] 感光元件尺寸单位 1" = 16mm ?!
时间Mon Aug 13 00:44:08 2012
建议看Dpreview这篇：
Sensor Sizes: Camera System: Glossary: Learn: Digital Photography Review
http://www.dpreview.com/learn/?/Glossary/Camera_System/sensor_sizes_01.htm
里面有一段话
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.
这应该就是原因了。
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