There was a nice thread on LuxRender about this

http://www.luxrender.net/forum/viewtopic.php?f=14&t=4766

In this case the CCD sensor or image plane simply is a plane with translucent
material with transmission set to 1 and reflection set to 0. An orthographic
camera was used to sample this image plane.

Would this be possible in POV-Ray...?

Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
> On 06/07/12 11:06, clipka wrote:
> > Am 05.07.2012 16:28, schrieb spitz:
> >> [mesh camera] Are there any examples using this feature? Maybe a
> >> lens projecting the image of an illuminated 3D scene on the
> >> mesh(film/CCD) showing depth of field.
> >
> > I have to hand that question over to the people who have more
> > experience with the feature; I only know it does exist, with a gut
> > feeling that it might be relevant for your task.
>
>    As one of the few who played with it, I'm not sure it could serve
> for his purpose, that is, to play with depth of field and focus. At
> least in a realistic way... In any case, here are the results of my
> tests with this feature:
>
> http://www.ignorancia.org/en/index.php?page=mesh-camera
>
>    As you see at the end, I'm guessing that some sort of "custom focal
> blur" could be achieved, but I didn't figure a way to do it.
>
>    I'm not at all an expert on optics (in fact I know next to nothing
> about the topic), but I think that just modeling the lenses as meshes
> and using these as mesh-cameras will not do the trick... standard focal
> blur doesn't work with mesh cameras (and anyhow it's not related to real
> world f-stops).
>
>    Again just guessing, but I have the feeling that what he needs is
> something like the camera implementation on the Lux renderer.
>
> --
> Jaime

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