How do telephoto lenses work?
Telephoto lenses are high-magnification devices and are used to photograph something from far away in order to flatten perspective or because the subject is too far away. Telephoto lenses require accurate focusing since they have shallow depth of field.What Makes a Telephoto Lens Work?In a telephoto lens, there is a lens element at the front of the camera, with a second element in the back of the lens that magnifies the front lens. This second element increases the focal length of the camera by making it seem as though the first lens is farther away than it really is.Compression of ImagesA long telephoto lens compresses the foreground and background into one compact image. Long telephoto lenses make it easier for the photographer to blur the background, even when depth of field is the same. The longer the lens, the more compressed the image will be.Focal LengthTelephoto lenses come in many different focal lengths and are dependent on what they will be used for. Moderate-length telephot
