I blog here:
JoeRaasch.com

I teach here:
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/

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