This article is the third in a series teaching the basics of photography. We started by learning about the properties of light and how an image is created, and we also learned how a lens bends light ...

When light moves from air into glass or plastic it is refracted close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ...

Extended-range zoom lenses, popular telephoto ranges, teleconverters, and telephoto lens buying and shooting tips. By Margaret Brown. Longer lenses magnify the scene, making subjects appear closer.