The colours are clipped before they contribute to the focal blur. You can 
easily change this by commenting out line 2442 in render.cpp which says
'Clip_Colour(C, C);' and recompile povray. I have posted an example to 
p.b.images which shows the result with the modified version in contrast to 
the normal version.

- Micha

-- 
http://objects.povworld.org - the POV-Ray Objects Collection

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