Re: [photo-3d] Beam splitters vs. Image splitters

[Ron Beck <rbeck@xxxxxxxx>]

Okay, I'm confused now.  How do you get a stereo pair with a beam
splitter and two cameras at right angles to each other.   I understand
how the "image splitter" works in that it has a left side and a right
side which are exposed on the negative.  However a single "beam" of
light, split in two provides the same image on both negatives.  Where is
the horizontal disparity with a beam splitting device? 

Where did I get lost in this?

Ron

pd@xxxxxxxxxxxxx wrote:
> 
> ----- Original Message -----
> From: "Bryan Mumford" <bryan@xxxxxxxxxxxx>
> To: <photo-3d@xxxxxxxxxxx>
> Sent: Tuesday, January 09, 2001 12:41 PM
> Subject: [photo-3d] Beam splitters vs. Image splitters
> 
> > If you are willing to educate me further, I'm curious why beam
> > splitters are used in photography. Why do you wish to capture the
> > same scene on two cameras?
> 
> The same could be said of stereo photography in general:  Why photograph the
> same scene twice?  The fact is that with two cameras at nearly right angles,
> and a suitably placed beamsplitter mirror, you can get stereo pairs, and you
> can vary the spacing and "toe" in ways that the sizes of the camera bodies
> would not allow with normal twin rigs.
> 
> -pd