ABSTRACT
THE APERTURE The aperture of the camera lens opens and closes like the iris of the human eye. Just as the human iris opens up in dim light and closes down in bright light to control the amount of light reaching the retina, the aperture of the camera lens must also be opened and closed in different lighting conditions to control the amount of light that reaches the film or image sensor. The film or image sensor requires exactly the right amount of light to create an image. Too much light and the image will be overexposed (film negatives appear very dark or dense when processed). Not enough light and the image will be underexposed (film negatives appear very light or ‘thin’ when processed).
