DoF defined: controlling depth of field in photography

DoF vs subject distance: subject far from the camera

Controlling depth of field via your aperture

 

Controlling depth of field with your aperture: f/2.8

A simple rule of physics means that when a small aperture such as f/22 is selected rather than a large aperture like f/2.8, the image will have more depth of field.

So, if you want to blur the background, select a large aperture and if you want to keep it sharp, choose a small one.

The middle ground, say f/8, is useful when there are a few objects that you want to keep sharp, but you want to avoid the background being very sharp.

Controlling depth of field with your aperture: f/13

Although it may be possible to close a lens’s aperture down as small as f/32 or even f/45, this isn’t usually advisable.

At very small apertures a phenomenon known as diffraction has a significant impact and actually makes images softer – even at the focus point.

For this reason professional landscape photographers don’t tend to use their lens’s smallest aperture setting and instead open up by a stop or so.

PAGE 1: What is depth of field?
PAGE 2: Controlling depth of field via your aperture
PAGE 3: Controlling DoF by focal length
PAGE 4: Subject distance and depth of field
PAGE 5: Using all three factors to control DoF

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