DOF depends on aperture value

Concepts in Photography

Depth of field

Portraits or still-life photos mostly acclaimed by people are the ones on which the background is out of focus so the subject looks pronounced. Depending on the focused areas, a photo can be blurred or sharpened. This is called 'a low DOF' or 'a high DOF'.

The depth of field is the focused area around the subject. Therefore, a small DOF signifies that the focused area is narrow and a large DOF means the focused area is wide.

A photo with a small DOF, which stresses the subject and makes the rest of it blurred, can be obtained by using a telescope lens or selecting a low aperture value. Conversely, a photo with a large DOF which shows all the elements on the photo sharply focused can be achieved by using a wide angle lens or selecting a high aperture value.

What controls out-of-focus effects?

The wider the aperture is (namely the lower the aperture value), the lower the DOF becomes. Under the condition where the focal length is equal, a low aperture value leads to a photo with a low DOF.

50 mm F5.7

50 mm F22

Small Depth of Field

Large Depth of Field

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