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# Why Field of View of Smartphone Camera Is Smaller Essay

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Field of view: The field of view is the extent of the observable world that is seen at any given moment. In photography, angle of view describes the angular extent of a given scene that is imaged by a camera. These two can be used interchangeably as field of view is proportional to angle of view.

Mathematically, in triangle abc, side ‘bc’ is the opposite of angle bac, & thus length of ‘bc’ depends on angle bac. In abc & ade, bac = dae, (Reciprocal angle). abc = aed (As bc||de & be intersects them, they are alternate angles) acb = ade (As bc||de & cd intersects them, they are alternate angles) Therefore, abc & ade are similar triangles & thus bc/de = ab/ae = ac/ad = k (some constant). Since, bc/de = k, => bc = k*de which implies that bc de (bc is proportional to de). This relation implies that, the field of view is proportional to the size of the sensor used in camera. Field of view also depends on the focal length of the lens.

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The above diagram shows that the Field of view is inversely proportional to the Focal Length of the lens used in a camera. Camera phones generally use sensor sizes in the range of ~1/4” to 2/3”. The problem of fitting a large sensor in a mobile device isn’t only about the sensor itself, the greater challenge is the fact that the larger the sensor, the larger the lens need to be. This is because larger sensors require one to get closer to their subject, or to use a longer focal length to fill the frame with that subject. So, to increase the field of view, we can’t enlarge the camera sensor as we wish or can’t decrease the focal length of the lens. And that’s why the field of view of smartphone camera/digital camera is smaller comparing to the field of view of human eyes.

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