I had a scene file where focal blur did not behave as I expected after a
camera transform.

camera{
    location -z look_at 0
   transform{Gregs_camera_transform}
}

Where Gregs_camera_transform is a function of  splines which determine look
at & position as a function of clock.  It needs to be a transform because
I'm using the same transform on my captions.


Then I tried to add focal blur and did not get at all what I expected.
Could someone who understands how the camera works tell me exactly how you'd
add focal blur to the above syntax?

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