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The Exposure- A summary
The exposure triangle is a vital part of photography, and consists of three parts: -The aperture, which controls the depth of field. -The shutter speed, which controls how quickly the light has to get in. -The ISO, which controls how much light gets absorbed. All of these can be used to balance each other out, to create a good exposure. |
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Aperture Example
The aperture controls the depth of field. A wide depth of field will make sure all planes are clearly visible- the aperture will be small, and a narrow depth of field will make sure only one plane is clearly visible- the aperture will be big. Here the aperture is large as only the lavender is in focus. |
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ISO example
The ISO controls how much light is absorbed. at a time. When a camera takes a photo, the ISOs absorb the light that's let in. The smaller the ISO the longer it takes for it to absorb enough light, so you'd need to adjust the other factors for a good exposure. This also means the photo gets grainier as the ISO increases. In this photo, there is a low ISO, which is why it is so sharp. |
Shutter Speed example
What the shutter speed does is quite self explanatory- it is how fast the shutter closes to take a picture. The more time it takes to close, the more time it has to absorb light, so you'd have to adjust the ISO in particular for a good exposure. A picture can become blurry if the camera isn't held still during a photo with a slow shutter speed, so a tripod would be good for these instances.You can use this to capture movement, and even light draw (see Light Theory). |