As an optical device, the main characteristic index of a lens is the focal length value. The focal length is a very important concept of the lens, because the focal length determines the size of the image formed by the film or CCD within a given distance. Doubling the focal length will also double the size of the image. The focal length of the lens is different, and the camera can shoot a wide scene. The degree is also different, the density of the scene shot at the same time is also different, and the photo effect is also different.
In traditional camera terminology, the focal length of a standard lens is approximately equal to the diagonal of the film. A standard 35mm camera uses a 24mm×36mm film with a focal length of approximately 43mm.
For a typical digital camera, the area of the CCD is much smaller than the area of the 35mm film. Therefore, the volume and focal length of the standard lens of a digital camera are much smaller than that of a 35mm film camera.
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