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Concepts in Photography
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.
Small depth of field
Large depth of field
What controls out-of-focus effects?
DOF depends on aperture value
The wider the aperture is (namely the lower the aperture value), the lower the DOF becomes.
Under the condition where the other values including the shutter speed and ISO sensitivity
are equal, a low aperture value leads to a photo with a low DOF.
50 mm F5.7
50 mm F22
180
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