Looking at the camera.cpp file I see that the default values for focal 
blur is not what is said in the Documentation.


camera.cpp:

Make_Vector(New->Focal_Point, 0.0,  0.0, 1.0);
New->Variance       = 1.0 / 10000.0;


Povray Documentation (6.4.3  Focal Blur):

"The default value is focal_point <0,0,0>"
"variance ... (the default is 1/128)."


I hope I didn't misunderstand anything but it looks like the actual 
Focal_point is the camera's Location plus <0,0,1> (one unit to 
z-direction) if the Focal_point is _not_ defined. If it _is_ defined, 
then the vector represents the actual pointm not offset. Please double 
check this. Variance seems to be really 1/10000 instead of 1/128.

Severi Salminen

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