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自从有了数码相机,“相当于”或“等效焦距”常见诸于摄影报端。众所周知,大部分数码单反相机的影像传感器面积小于“全画幅”(指传统36mm×24mm画幅),如APS—C和4/3规格。当传统35mm相机使用的镜头用于上述数码单反相机后,由于原有的视场角受到“裁切”而变小,因此造成镜头焦距变“长”这种现象,“相当于”或“等效焦距”一词应运而生,因此不难理解,无论“相
Ever since there was a digital camera, ”Equivalent to “ or ”Equivalent Focal Length “ is common in photographic newspapers. As we all know, most of the digital SLR camera image sensor area is less than ”full frame “ (referring to the traditional 36mm * 24mm frame), such as APS-C and 4/3 specifications. When the lens used in the traditional 35mm camera is used in the above digital SLR camera, the phenomenon that the focal length of the lens becomes ”long“ due to the original field of view is reduced by ”cropping“ The term ”equivalent focal length“ appears at the very beginning of the text, so it is easy to understand whether ”