IMPORTANT: Install this AFTER you've installed the main files!
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Depth Of Field: http://en.wikipedia.org/wiki/Depth_of_field


Auto-Focus DOF: Focuses when you get close to something and blurs everything around it, just like a camera. This has no performance drop at all. If you want a clear and sharp image, don't install this.

Static DOF: This makes a constant bokeh blur in whatever distance you choose, but also gives a big performance drop, only recommended for screenshots.

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Installation:
Copy the files inside one of the folders to your GTA IV or EFLC main folder.