![]() The focal length of the lens does not change by using a smaller imaging area the field of view is correspondingly smaller because a smaller area of the image circle cast by the lens is used by the smaller imaging area.Ī 50 mm lens on an APS-C format (crop factor 1.6) images a slightly smaller field of view than a 70 mm lens on a 35 mm camera. If it is desired to capture an image with the same field of view and image quality but different cameras, the aperture and ISO settings also need to be adjusted with respect to the crop factor. For example, a lens with a 50 mm focal length on an imaging area with a crop factor of 1.6 with respect to the reference format (usually 35 mm) will yield the same field of view that a lens with an 80 mm focal length will yield on the reference format. Lens focal length by the crop factor gives the focal length of a lens that would yield the same field of view if used on the reference format. The crop factor is sometimes referred to as the focal length multiplier ("Film") since multiplying a View and image quality of different cameras with the same lens. ![]() The crop factor is sometimes used to compare the field of Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths the ratio of sensor areas is the square of the crop factor. The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question that is, CF = diag 35 mm / diag sensor. ![]() In the case of digital cameras, the imaging device would be a digital sensor. In digital photography, the crop factor, format factor, or focal length multiplier of an image sensor format is the ratio of the dimensions of a camera's imaging area compared to a reference format most often, this term is applied to digital cameras, relative to 35 mm film format as a reference. (The actual image circle of most lenses designed for 35 mm SLR format would extend further beyond the red box than shown in the above image.) The outer, red box displays what a 24×36 mm sensor would see, the inner, blue box displays what a 15×23 mm sensor would see. ![]()
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