How the Defunct APEX System Inspired Aperture and Shutter Priority Modes

Photography is an art and science deeply rooted in the manipulation of light. From the earliest days of the camera obscura to the digital age, photographers have sought to control exposure—the amount of light that reaches the camera sensor or film—to create compelling images. Central to this control are the variables of aperture, shutter speed, and ISO (no, ISO does not actually change the sensitivity but nevertheless plays an integral role in exposure choices).

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