The main function of the camera lens is to focus the image sharply on the film. But they do a lot more than that: the lens aperture allows us to control the amount of light reaching the film and the depth of the field. Lenses are termed as ‘standard', ‘wide-angle' or ‘tele-photo' according to the focal length. But these are relative terms and differ from format to format.
[...] Things you should know about camera lens Introduction The main function of the camera lens is to focus the image sharply on the film. But they do a lot more than that: the lens aperture allows us to control the amount of light reaching the film and the depth of the field. Lenses are termed as ‘standard', ‘wide-angle' or ‘tele-photo' according to the focal length. But these are relative terms and differ from format to format. For example, a 55 mm is a standard focal length for a 35 mm camera but a wide angle for a 6 x 6 cm medium format camera. [...]
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