Move your focus distance closer. The DOF blur works like a camera, kind of. The focus distance is the focus ring of the camera, it adjusts how far away the center of your in-focus area will be. The aperture adjusts how wide (in z-space) your in-focus area is, and the blur controls how much or how quickly things become out or focus. Does that help?
I have a number of layers strewn about in z space, and I want my foreground layers in focus and my background layers out of focus. But for the life of me I can't seem to find the right combo of aperture / focus-distance / blur level. If I increase the aperture, some of my foreground layers go blurry. If I lower it, everything in the background comes back into focus. I can't seem to create a window that keeps the desired FG objects in focus while throwing the BG objects out of focus. I wonder if I'm using some non-standard values, or perhaps i'm asking for something that's not possible.
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