Originally Posted by threed123
A simple guide is that objects in the distance (e.g. at infinity) should have a parallax separation of no more than the width of your eyes--typically 2.5 inches. If it is larger than that, you might not be able to join the two images and ghosting or eyestrain happens.
Yes, if the separation is larger than 2.5 inches than it's physically impossible to fuse the pictures (slight divergence of about 1 degree is possible, though). However, ghosting is already visible at smaller separations (it depends on the particular TV screen, though).
Moreover, separation of 2.5 inches on the average TV size might be too large for the average viewer. Even though the eyes are still converging or are in parallel, the average viewer cannot fuse such picture easily (depends on a distance to display as well) due to excessive depth. Personally, I can view really "impossible" 3D pictures (by the way, the above pictures have excessive parallax for background objects when viewed on larger screen). However, most of my colleagues are complaining that their eyes are hurting or that they cannot fuse the picture if the parallax is too high (even though the separation is less than 2.5 inches). I never received any complaints if the parallax was less than 1/30 of the screen width for many different screen sizes.
So, Lamaman1971, have you tried with pictures will smaller parallax? Maybe you can upload one of the "problematic" pictures, so we can see if parallax/contrast is OK?