Exposure Triangle
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The aperture is the hole or opening which allows light into the camera, like the iris in our eyes. With a smaller hole less light comes in which means the image is more clear which means it has more depth of field. this also means the image would be darker and that would result in tinkering with the other two elements the exposure triangle; shutter speed and ISO. This would be the opposite with a larger aperture as there would be more light coming through which means the camera would be focusing on one object whilst the rest would be blurry.
the aperture is measured with f-stops. f2.8 is a large aperture and f22 is a small aperture. |
The ISO is the sensitivity to light. This is useful when you are either in bright conditions or dark conditions. A higher ISO will make an image lighter and a lower ISO will make it darker. However with a higher ISO, the image would be noisy or grainy but with a lower number, the image may be darker but more crisp and presentable. The light is detected by a sensor in the camera and with a higher ISO it is more sensitive to light hence why it is lighter.
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Shutter speed is how fast the camera takes a photo. A fast shutter speed such as 1/1000 will take a photo really quickly and because of this, if the subject the camera was focusing on was moving, the subject would appear to stay still. However if the shutter speed was 1/2 a second then the shutter has stayed open for a longer time which means the photo would introduce motion blur if the subject was moving. if the shutter has been open for a longer period of time, then more light will have come through to the picture however if the shutter has been open for a shorter period of time then the amount of light let in would be decreased.
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