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What is depth of field?

The depth of field is how much of the photograph is in focus. For example, a photograph has “shallow depth of field” if the foreground is in focus and the background is out of focus. In the fololwing photograph, there is a long depth of field, the sunflowers in the foreground are in focus and so are the ones in the distance.   In the following photograph, there is a shallow depth of field, there is one sunflower in focus and then everything in the background is very blurred.   How to control the depth of field The depth of field of a photograph is controlled by the aperture. When you use a wide aperture such as f/2.8 – you will create a shallow depth of field. When you use a small aperture such as f/22 – you will...

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What is aperture?

Aperture is the hole through which light travels into the camera. It sits behind the lens and in front of the sensor. As you can see in this picture, the hole is created by lots of shutters. This enables the size of the hole to change. When the hole is larger, more light passes onto the sensor, and vice versa. Somewhat confusingly, a large aperture has a number like f/2.8 and a small aperture has a number like f/22. What does aperture affect? In low light situations, we need to use a wide aperture, like f/2.8. This will enable lots of light to get into the sensor. However, it also reduces the depth of field, meaning less of the photograph will be in focus. When we use a narrow aperture, like f/22, lots of the photograph can be in focus, from the foreground...

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