Aperture of a camera is like the opening of our eye, all called pupil. The pupil of an eye has many functions, but analogue to the aperture of the camera we can learn the following things (here we will learn each of the elements of camera independent of other feature available on the camera to understand each of the functions independently):
- Control entry of light: When it is dark, the pupil expands to allow more light to come in and when there is too much light around, it contracts to restrict the entry of flight to have a perfect vision. Thus when there is less light, to capture the perfect image more light has to enter thus one must choose high aperture. In case there is too much light, the aperture size must be reduced to reduce the amount of light entering the lens.
- To manage distance of the object: When we have to see objects very close to us our pupils tend to widen to form a cone such that all the other light form objects around do not distract our vision. Thus results in luring of everything else. Example when we put our palm very close to our eyes and try to focus on it, all the otters distant objects go out of focus. Similarly when we have to view object at a very large distance, we tend to skew our eye, thus decreasing the site of aperture to let everything in the vision to be in focus. Similarly in a camera, when we need to focus on closer objects (such as in case of portrait) we must choose high aperture, this will also lead to bluing of all the background. In case we want a landscape picture, where we need all the objects in the distance in focus, we use a lower aperture.
- Depth of field: Now Taking forward the previous point ahead, when aperture is large on the object in focus will be clear, thus the depth of field is low and when the aperture is high, the depth will be high, as all of the background will be in sight.
Thus in conclusion to recollect all Use
- Large aperture for: Portrait, low lighting, for low depth and blurred background
- Small aperture for: Landscape, high lighting, how high depth and clear background
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