Understanding the Exposure Triangle ISO, Aperture and Shutter are known as the “exposure triangle”. If you know how to control or adjust these elements, taking well exposed photos will not be a problem for you. Let us look at each element closely and understand how they can help you achieve the right exposure. The ISO refers to ratings that define the sensitivity level of your camera to light. ISO value is determined by numbers: the lower the number, the lower the sensitivity to light. Higher values mean it is more sensitive to light. The aperture is all about controlling the amount of light that gets to the digital sensor of your camera. The aperture is the opening found in your camera lens. The aperture setting is determined by several f-stop values. When you adjust the aperture, note that as the numerical value increases, the aperture becomes smaller and the amount of light that gets through decreases. Also, the smaller the aperture size, the wider your depth of field — a deeper portion of your photo will be in focus. For shallow depth of field photos, use a larger aperture size (i.e. a smaller numerical f-stop value). Every time you press the shutter button, a door that opens and closes is found in front of your camera’s sensor. This is the shutter mechanism that determines the length of time the sensor is exposed to light. In other words, while aperture controls how much light reaches your sensor, and shutter speed controls how long light reaches your sensor. The shutter speed is measured in fractions of a second, e.g. 1/100s. Remember the smaller the fraction, the faster the shutter opens and closes.
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Mrs. BibleDigital Media & Art Educator Archives
May 2022
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