The Screen Plane Method

For some shots, we don't care about the exact parallax range - and what really matter is the exact location of the screen plane, to avoid stereoscopic window violations, especially when shooting for small screens.

Once the far parallax is set (by using angulation or post-production shift), we slowly increase the interaxial while watching the 3D compositing monitor, until the screen plane (that is: objects with no parallax) is where we want it to be.

Note : again, when shooting indoors, increasing the interaxial will in most cases bring the background closer to the audiance. So we might want (or not) to go back to the first step to readjust the far parallax.

Here again, we may use a stereo 3D calculator (as complex as a specialized software or as simple as an Excel spreadsheet). There is no easy formula useable on set in one's head to set the screen plane.