Crop factor is a term that is quite often heard in the world of digital photography. Crop factor closely related to the ratio of the size of the resulting image compared to the size of the reference, in this case the reference in question is the size of 35mm film (the size of the image in the film is 36 x 24mm). Mathematically, the crop factor is the ratio between the diagonal of 35mm film (43.3mm) diagonal image with a digital camera sensor.

Crop Factor (CF) = Diagonal 35mm / Diagonal image sensor
Image size is based on the size of the camera sensor
In the current world of digital photography cameras have image sensors that measure the size of a 35mm film called with a full frame camera (eg Nikon D4, Nikon D800, Canon 5D, Canon 1DX) while the size of the camera image sensor is smaller than 35mm film camera called crop or also known as APS-C cameras (Advanced Photo System type C).

Crop Factor on a variety of digital cameras:

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