In the scene below, the use of focal blur makes the image much brighter, as
though the blurred component is added to the original sample, rather than
some kind of (possibly weighted) average.  I'm not sure if this is supposed
to happen or not, but I've tweaked all the blur parameters to the extremes
and nothing has changed the extra brightness.  What do you think?

#version 3.1;

global_settings
{
  assumed_gamma 1.000
  ambient_light 0.000
  max_trace_level 25
}

#declare blur = 1;

camera
{
  location  < 0.000, 0.500,-1.000>
  look_at   < 0.000, 0.000, 0.000>
  #if(blur=1)
    aperture 0.100
    blur_samples 7
    focal_point < 0.000, 0.000, 0.000>
    confidence 0.900
    variance 1/128
  #end
}

light_source
{
  <-3.000, 2.500,-2.000>
  color < 1.000, 1.000, 1.000>
}

sphere
{
  < 0.000, 0.000, 0.000>, 0.200
  texture
  {
    pigment
    {
      colour < 1, 1, 1>
    }
  }
}

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