> I can't give you a definite answer, but, here's my interpretation :
> The "f" parameter could be seen as the ratio between the length of the
> direction vector and the apperture value. It don't mather if that plane
> is in front or beheind the camera's location, just the absolute values
> count.
> The focal length could be seen as the length of the direction vector.

Thanks for that! I'll try it out and see if these work. Might need some
experimenting. Although I have to ask: why isn't there a definite answer to this
question? Is this something that POVRay doesn't want to simulate as such?
Because they (focal length, aperture) seem to be pretty standard things a person
would want to set in their scene setups when they place their camera, and be
able to easily control them to see changes/effects etc. in their outputs.

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