Nuke ZDefocus Tutorial HD

I blog here: www.JoeRaasch.com I teach here: www.SenecaVFX.com Nuke 7 added a new tool to create defocus effects on to your images, zDefocus. This video goes over: -The difference between a defocus and a blur -Older tools in Nuke that create defocus effects: Convolve and Defocus -The new zDefocus tool. -How would you apply this tool to a image that has no imbedded depth information -How would you apply this tool to a 3D render that has depth information. You can download the EXR file I used here: joeraasch.com/defocusing-an-image-in-nuke/