Very Informative Depth-of-field Tutorial
Depth of Field Explained (by snodart.com) from NT on Vimeo.
This was a great tutorial I came across that explained exactly how Depth-of-Field works, and what it means for your image. It's originally from SnodArt.com, along with alot of other fantastic tutorials, so check them out, you can never learn to much about how your Camera works!
Additional, here is a great Calculator feature I found that handles Depth-of-field calculations, that you might want to...
