Help adapting FredBorg DOF Effect to any camzoom

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Pinete

Hi,
I'm trying to adapt the Fredborg Depth of field effect:

http://www.blitzbasic.com/codearcs/codearcs.php?code=1030

to work with any camerazoom value, but I don't obtain
the desired results.

I'm trying to multiply the position of each layer with
(1.0/camerazoom), with x, with y, with z, but it doesn't
works!

Please, could someone help me?
What line of the function should I change in order to
make the effect valid for any camerazoom value??

Thanks in advance!