The distance between the nearest and farthest points that appear sharp (in focus) in a photograph.
How do You Control it?
By adjusting the aperture setting (f-stop number).
Aperture is the size of the lens opening.
Larger aperture (smaller number) gives shallow depth of field (blurry background)
Smaller aperture (bigger number) gives large depth of field (background in focus)
*A large aperture (f/1.8) gives you a shallow depth of field, while a small aperture (f/8) gives you a large depth of field. (see photo)
How to Adjust Aperture
Set your camera to aperture priority mode (the capital letter “A” on the top dial.)
Looking at the f-stop number (located on the right of the display screen) turn the command dial (located at the top of the camera) either left or right depending on how small or large you want the aperture.
On aperture priority mode, the camera will adjust the shutter speed (number on the left side of the display menu) for you automatically.
Why Use Shallow Depth of Field?
Useful when you only want a certain part of the photo in focus. Ex:
Main focus of the photograph
Why Use Large Depth of Field?
Useful for when you want the entire photograph in focus. Ex:
Which is My Favourite?
Shallow depth of field.
Why? Just look at the picture above and you’ll see.