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In photography, the 35 mm equivalent focal length is a measure that indicates the angle of view of a particular combination of a camera lens and film or sensor size. The term is useful because most photographers experienced with interchangeable lenses are most familiar with the 35 mm film format. On any 35 mm film camera, a 28 mm lens is a wide-angle lens, and a 200 mm lens is a long-focus lens. However, now that digital cameras have mostly replaced 35 mm cameras, there is no uniform relation between the focal length of a lens and the angle of view, since the size of the camera sensor also determines angle of view, and sensor size is not standardized as film size was. The 35 mm equivalent focal length of a particular lens–sensor combination is the focal length that one would need for a 35 mm film camera to obtain the same angle of view. Most commonly, the 35 mm equivalent focal length is based on equal ''diagonal'' angle of view.〔(What is "35 mm equivalent focal length?" ) The Panorama Factory, 2004.〕 This definition also in the CIPA guideline DCG-001.〔(CIPA DCG-001-Translation-2005 Guideline for Noting Digital Camera Specifications in Catalogs )〕 Alternatively, it may sometimes be based on ''horizontal'' angle of view. Since 35 mm film is normally used for images with an aspect ratio (width-to-height ratio) of 3:2, while many digital cameras have a 4:3 aspect ratio, which have different diagonal-to-width ratios, these two definitions are often not equivalent. ==Calculation== 35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.5x for NikonAPS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6x for Canon APS-C format, 2x for Micro Four Thirds format, 2.7x for 1-inch sensors (used in Nikon 1 cameras and some Sony RX cameras), crop factors of 5x to 6x for compact digital cameras and even higher crop factors for built-in cameras of mobile devices like cell phones or tablets. According to CIPA guidelines〔 35 mm equivalent focal length are to be calculated like this: “Converted focal length into 35mm camera” = Diagonal distance of image area in the 35mm camera (43.27mm) / Diagonal distance of image area on the image sensor of the DSC × focal length of the lens of the DSC. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「35 mm equivalent focal length」の詳細全文を読む スポンサード リンク
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