Fang Zei said:

Re: the whole 3D discussion,

I recall seeing a comparison between the 2D and 3D blu-rays of one of the Ice Age movies. Everything was in focus on the 3D version, while the 2D had depth of field.

This is a whole lot simpler when everything's being rendered in the computer to begin with. You simply do separate renders. But when we're talking about actual photography in the real world, it's a bit more complicated.

You just need really thin glass and a very narrow f-stop (f32). It wouldn't be that hard. Standard compact digital cameras have very thin and have virtually no depth of field. However, those cameras can't have f-stops narrow enough to make everything perfectly in focus. i know it is possible, just not sure if an equivalent professional end lens is out there for any of the professional cameras used to shoot films.

And even for rendering, they are adjusting all the camera settings inside the software shot-for-shot just as they would converting no-depth 3d to 2d with depth.