Taking a photo of someone or something from very far away should therefore be done only when necessary. However, normalizing the relative size too much can make the scene appear static, flat and uninteresting, since our eyes generally expect closer objects to be a little larger. On the other hand, if a normal focal length lens were used, and one were closer to the foreground people, then they would appear much larger relative to the size of the building. In the telephoto example to the left, the people in the foreground appear quite small compared to the background building. For full impact, you'll want to get as far as possible from the nearest subject in the scene (and zoom in if necessary). This normalization of relative size can be used to give a proper sense of scale. Objects appear in proper proportion to one another. The reason for this is the angle of view: This causes nearby objects to appear similar in size compared to far away objects - even if the closer object would actually appear larger in person. TELEPHOTO PERSPECTIVEĪ telephoto lens is special because it has a narrow angle of view - but what does this actually do? A narrow angle of view means that both the relative size and distance is normalized when comparing near and far objects. Confused? More on this in the next section. Why? The distance from your subject actually changes your photo's perspective, even if your subject is still captured at the same size in your camera frame. Yes, this isn't practical with a lion, but a pet or a person will likely appear better when they aren't photographed from afar. While this is a legitimate use, there's a whole array of other possibilities, and often times distant objects are better photographed by simply getting a little closer. Why use a telephoto lens? A common misconception is that telephoto lenses are just for capturing distant objects. The angle of view therefore still increases similarly. The location where light rays cross is not necessarily equal to the focal length, but is instead roughly proportional to this distance. The above diagrams depict the maximum angles that light rays can take when hitting your camera's sensor.
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