I have not read every post in this thread, but from what I have read, In think everyone is neglecting an important point. People are talking about making two cameras parallel, but I don't think that is how it should be. In real life would not both eyes point inwards towards a point of focus? And thus, should not stereo cameras do the same? I have no special knowledge of the human visual system, or stereoscopic photography, but it just seems to be that parallel cameras would give a totally wrong and unnatural effect. Anyone have any thoughts on this? At the moment I have started to construct a set of stereo cameras that work on the assumption that my above theory is correct. The cameras will be linked entirely by ERC, including zoom. Poser 'Point At' will be used to get the parallax adjustment, which will need to be set manually, as appropriate to the particular scene, and including animation.

Quote - Zooming as in changing the focal length? The human eye can't do that, it has a fixed focal length.

That is true, but it is also true that the fact hasn't stopped movie makers using zoom. In the movies anything is possible, and reality is never allowed to get in the way of a good fantasy.