Understanding Depth of Field is important, this video by Dylan Bennett gives you a good overview of what it is, how it works and how to control it.
![Shallow Depth of Field](http://snapsort.wpenginepowered.com/files/2012/04/Shallow-Depth-of-Field.jpg)
![Wide Depth of Field](http://snapsort.wpenginepowered.com/files/2012/04/Wide-Depth-of-Field.jpg)
Understanding Depth of Field is important, this video by Dylan Bennett gives you a good overview of what it is, how it works and how to control it.