> f/2 mean that the aperture is exactly half the distance between the
> optical center of the lens and the film/detector.
> In POV-Ray terms, that should be about half the direction vector length.
> Do some testing using a fraction of the direction vector and the
> distance between the camera and focal_point.

> > But what does focal_point really do in the context of the tracing done?
> >
> It define the plane of sharpness, every ray shot toward any given point
> on that plane will represent exactly the same pixel in the final image.

It seems like from what you are saying is that the distance between the camera
location
set by the 'location' parameter and the 'focal_point' = focal length of lens.
But wouldn't that mean that all rays always come from infinity? Because if my
'plane of sharpness' is always around the focal plane of the lens, that means
rays always
come from infinity, which would mean I cannot test any other in-focus pair. For
example,
by the simple thin lens formula, if v=1.1f, then u=11f. Which means for an
object placed
11f on one side of the lens, I should be able to place a film 1.1f on the other
side and
be able to see at least the object at 11f in focus and other objects blurred
with respect
to their distance from the 'plane of sharpness' (which would now be around 11f).
How can I see such an effect in POVRay?

> Yes. When the change from a new sample get less that a threshold value,
> you say, this is close enough and I don't need to get any new sample.
Understood!

1 more request: Will it be possible to have a chat with you somehow? I would
like to have
a bit more back-and-forth on this, if that's okay with you. Should I mail you,
or is any
other platform more suitable?

Thanks for all your clarifications regarding this!

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