The shutter triangle is a concept in photography that refers to the three main factors that affect the exposure of a photograph: aperture, shutter speed, and ISO. These three factors work together to determine how much light is let in to the camera when a photo is taken.
Aperture is the size of the opening in the lens that allows light to pass through to the camera's sensor. A larger aperture (a smaller number) lets in more light, while a smaller aperture (a larger number) lets in less light.
Shutter speed refers to the amount of time that the camera's shutter is open when a photo is taken. A faster shutter speed (a larger number) allows less light to reach the sensor, while a slower shutter speed (a smaller number) allows more light to reach the sensor.
ISO is a measure of the sensitivity of the camera's sensor to light. A higher ISO (a larger number) means that the sensor is more sensitive to light, while a lower ISO (a smaller number) means that the sensor is less sensitive to light.
By adjusting these three factors, you can achieve the right exposure for your photograph. For example, if you're taking a photo in low light and you want to let more light in, you might increase the aperture, decrease the shutter speed, or increase the ISO. On the other hand, if you're taking a photo in bright light and you want to let less light in, you might decrease the aperture, increase the shutter speed, or decrease the ISO.
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