Example 1: high depth of field
Example 2: shallow depth of field
okay children, settle down and prepare for this evening's lesson. tonight we'll be talking about depth of field, or dof as i like to call it. as you can see in the above two examples, dof is all a matter of focus: what part of the scene do you want in focus? as you can see, everything in example 1 is in focus whereas in example 2, only the two leaves are in focus while the background is blurred. essentially, the desired depth of field can be achieved through the use of the len's aperture. The smaller the aperture setting, say f1.4, focusing on the object is critical, and you will end up with a shallow depth of field: example 2. With a higher aperature setting, say f16, more of the scene will be in focus. dof changes with the length of camera lens as well. but since i have minimal experience with different lenses, i will not go into detail. so make sure you keep in mind the focal point of your scene and change the aperature setting accordingly. remember, this is all in a nut-shell. for an indepth understanding of depth of field, seek elsewhere.