Depth of field is the near to far sharpness in your pictures. A picture with shallow depth of field has only the main subject in focus, and everything in front of it and behind it is blurred. The opposite is a picture with deep depth of field, where everything is sharp from right up close […]
Shallow depth of field
Shallow depth of field is where only your main subject is in sharp focus and the sharpness falls away quickly in front of or behind it. It's a popular technique for producing defocused backgrounds in portraits, for example.