- Aperture of the lens - The aperture of the lens is how big the hole is that the light goes through. You can adjust this in many cameras. The aperture for a camera is usually adjusted by an f-stop. The lower the f-stop the bigger the hole. A wide aperture can be good when you want a fast shutter speed, but have a low light photo. The aperture setting determines the depth of field or how much of the photo is in focus. A big aperture will cause a narrow depth of field. So you can focus the camera in on your subject and the background of the photo will be out of focus.
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