Attached Link: http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=783641

what ended up working best for me when I was trying to figure this out was to use the button to set the focal length to whatever object I had selected to be in focus. Then I would adjust the lens radius slightly lower than default to bring nearer/farther objects into focus, and higher to blur them more. In the image at the link, I had the focal length set to second sphere from the camera, and I think the lens radius is at .07 or .06 It was a while back and I'm not at my computer at the moment, but I think that's right. hope that helps a little