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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 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
It has now been superseded by the Canon EF 28–300mm lens. When used on a digital EOS body with a field of view compensation factor of 1.6x, such as the Canon EOS 7D, it provides a narrow field of view, equivalent to a 56–560mm lens mounted on a 35mm frame body. [1] [2] The lens contains 21 elements in 15 groups.
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 crop factor is sometimes used to compare the field of view and image quality of different cameras with the same lens.
The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras, a lens of a given focal length gives a narrower field of view in such cameras.
Angle of view can also be determined using FOV tables or paper or software lens calculators. [ 5 ] Log-log graphs of lens focal length vs crop factor vs equivalent focal length for 35 mm film or image sensor size (= the focal length multiplied by a crop factor) vs diagonal, horizontal and vertical angles of view for film or sensors of 3:2 and 4 ...
The Canon EF-S 18–55mm lens f / 3.5–5.6 is a Canon-produced wide-angle to mid telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8–88mm, and it is a standard kit lens on Canon's consumer APS-C DSLRs.