Just set focal_point to be whatever you want, like:

camera
{
    //blah

    aperture whatever
    blur_samples whatever
    confidence whatever
    variance whatever

    focal_point wherever //This is where it's focused at
}

(P.S. To people who know much more than me: is this right?)
(P.S.2: is there a mathematical relation between the aperture and the
f-stops on a camera?)

--
Me (Daniel Lin (dli### [at] yahoocom))

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