ABSTRACT
The camera offers three major controls over image exposure. First is the ISO setting, the image sensor's sensitivity to the incoming light. Second is the lens aperture, which we frequently, but not quite accurately, called the f/stop. And third is the shutter speed, which determines the length of time the incoming light is permitted to strike the sensor. Many new digital photographer tries to judge exposure by the brightness of the image displayed on the camera LCD monitor. The appearance of the image on the monitor is markedly affected by ambient light, yet in darker surroundings, the very same image seems overexposed. Overexposure is perhaps the photographer's most egregious blunder next to dropping his new camera onto the rocks. In spite of our preferences though, for those who do choose to use automatic exposure modes, know that Aperture-priority makes the most sense in changing light because of the importance of depth-of-field control in close-up work.
