Use the Interaxial Separation and Zero Parallax settings to adjust the anaglyph effect.
The red and cyan imaging of the grid and the Nurbs objects are nowmerged.
The 3-D depth of field effect starts to appear as the left and right camera move away from the center camera. You can adjust the focus of objects in the background by adjusting the Zero Parallax. If you move the slider too far the effect will not appear correct due to the left and right camera being too far apart.
You have now created a simple anaglyph effect with a stereoscopic camera. Now you can render out the images from each camera.