For some reason, some people tend to get a “Pinocchio Nose” when they talk about stereoscopic depth.
More than about 3.8% Stereoscopic Net Deviation will introduce a depth distortion, depending on the horizontal field of view, e.g., how far away you are from the image.
Less horizontal field of view will make excessive stereoscopic depth look relatively “deeper” and more horizontal field of view will make it look relatively “flatter”.
2.8% to 3.8% Net Deviation does not usually introduce noticeable amounts of this distortion effect.
0% to about 2.8% Net Deviation will always look “flatter than normal”, no matter what horizontal field of view is used.
The head in this image has more than 8% Net Deviation.
Watch the nose grow as the horizontal field of view decreases.
Watch this video in 3D by clicking on the “3D” button under the video and selecting your options.
If you are using red/cyan anaglyph glasses, be sure to select “Red/Cyan” then “Optimized (Dubois)”.
Crossed-viewing, which can introduce a down-scaling illusion, is not recommended for depth-analysis.