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A 50 mm (focal length) lens on an APS-C image sensor format (crop factor 1.6) images a slightly smaller field of view than a 70 mm lens on a 35 mm sensor format camera (full frame sensor). A 80 mm lens (1.6 × 50 mm = 80 mm) with a full frame camera gives the same field of view as this 50 mm lens and APS-C sensor format combination produces.
While Canon uses a factor of 1.6×, the other four brands all use 1.5×. APS-C cameras use a smaller area to form the image than traditional 35 mm cameras, and so lenses used on APS-C format cameras have a correspondingly narrower field of view. For example, a 28 mm lens is a wide angle lens on a traditional 35 mm camera.
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 ...
370 mm 2 area APS-C standard format from Nikon, Pentax, Sony, Fujifilm, Sigma (crop factor 1.5) (actual APS-C film is bigger, however) 330 mm 2 area APS-C smaller format from Canon (crop factor 1.6) 225 mm 2 area Micro Four Thirds System format from Panasonic, OM System, Blackmagic Design, and Polaroid (crop factor 2.0)
Canon has launched its first EOS R APS-C crop sensor cameras, the 32-megapixel EOS R7 and 24-megapixel EOS R10.
Presently the format names APS-C and APS-H are most often used in reference to various makes of digital SLR that contain imaging sensors that have approximately the same crop factor as those formats, albeit with different actual dimensions, as APS-H digital sensors have a 3:2 aspect ratio, not the 16:9 aspect ratio of the APS-H film frame.