Depth of Field

Depth of Field is an important factor in photography, the following link will take you to a website that describes depth of field in quite complex language: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm this is good because it helps you understand how it works and how to use it.

This photo is a good example of a shallow depth of field because the objects in the foreground are sharp and the background is out of focus, it was taken by Tedric Garrison. Furthermore the following photo has a large depth of field because everything as far as you can see is in focus.