They main problem with POV-Ray's focal blur is just that the *default*
settings produce a very grainy result, which is a shame because it gives
people the wrong impression.
  Fine-tuning the focal blur parameters can indeed give an excellent result
even without the rendering time going through the roof.

  The biggest advantage of using POV-Ray's own focal blur is physical
correctness. This can be seen specially in reflections (and refractions
if there would be any): It's impossible to get a physically correct
result in reflections/refractions with the post-process focal blur.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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