The setting on a DSLR that determines how much light the camera can absorb. ISO Aperture Shutter Exposure

The setting on a DSLR that determines how much light the camera can absorb is the aperture. The aperture is represented by f-stops (e.g., f/2.8, f/5.6) and controls the size of the opening in the lens through which light enters the camera. A smaller f-number (e.g., f/2.8) means a larger aperture, allowing more light to enter, while a larger f-number (e.g., f/16) means a smaller aperture, allowing less light to enter.