Depth of field is the characteristic of how much of, or how deeply, the photograph is in focus. If the main subject is in focus but the foreground and background are blurred, the photo is said to have a shallow depth of field. if most of the photo is in focus, including the foreground and background, the photo is said to have a wide depth of field.
Depth of field is controlled by the aperture setting: - A
wide aperture setting (indicated by a
low f-stop number) will provide shallow depth of field, resulting in the main subject being in focus and the foreground and background being blurry. This setting is particularly useful when taking
portraits or when using a macro lens.
- A
narrow aperture setting (indicated by a
higher f-stop number) will provide wider depth of field, resulting in the entire photo being in focus. This setting is particularly useful when taking
landscape or wide-angle photographs.
The
photographs below are examples of how the same subject will photograph using different aperture settings. Note that as the aperture closes, which will allow less light to reach the
image sensor, the shutter speed gets faster to produce the appropriate exposure.
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