InterOcular and InterAxiel are commonly referred to as “IO” or “IA”
That is the distance between the cameras lens center which sets the scale of the 3D to the Viewer.
Once this is shot and the relationship is captured the IO cannot be changed or adjusted later in Post editing.
Convergence-is the point in the depth of the shot where the 2 or more cameras intersect the same place.
Objects placed in front or behind the Point of Convergence are often spoken of as being in “Z” space.
Between Camera and Convergence point “NEGATIVE Z”
Between Convergence and Background is “POSITIVE Z”
The convergence point can EASILY be adjusted in post edit to set the “Z” where it is comfortable to watch.
Knowing where to set the Convergence and InterOcular require a very high degree of experience and expertise.
weighing the elements of the shot to set the IO and C properly is the job of the Stereographer.
Knowing what can and cannot be adjusted later force proper decisions made in the field.
The main things the Stereographer needs to consider is:
What is the 1 screen size this will be viewed on for proper scale and 3D strength. Set by IO & C relationship.
What is the distance to the subject and the distance to the background. Are they in safe range.
What is the focal length and magnification of the lens. and movement in the shot.
Is my rig properly aligned for proper consistent performance through full range of zoom.
MIO 3D™ (Multiple InterOcular 3-D), patent pending, is a new simplified method of shooting, editing, and viewing 3D.
IO 3D offers Solid fixed mounting points for 3 or more cameras in succession. This method solves a few problems.
Multiple screen sizes can be used due to multiple IO’s being shot. Safe range of a shot is now expanded due to multiple IO’s being available in Post. Fixed focal length wide angle deep DOF cameras mounted to solid plate allow one time Alignment in post. Pick up the Rig turn it on roll to record all cameras Mark sync with MultiSlate, shoot 3D Calibration Alignment chart on back of MultiSlate.
Once Shot then aligned and set in You get to choose strong, medium, or weak 3D, it’s Your IO. Fairburn 3D MultiPlate 3×3, 2×3, 1×3, and MultiGrip along with 3D MultiSlate provide versatile 3D mounting solutions for almost any camera. Mount 1, 2, or even 3 cameras to the MultiPlate to shoot MIO 3D. MultiPlates also mount to each other to build endless shooting platforms. Wearable cameras, handi-cams, HDSLR’s, and still photo cameras can now be mounted together for 3D action sports, training, and military use.
By attaching cameras to the Mounting holes you can shoot conventional 2 camera 3D. By using my Shooting method of MIO 3D you can attach more cameras (3 or more) to give you choices later which pair to use and view later. This Simple idea will change how we shoot 3D and make the process simple and easy for people wanting to get into 3D. You get to decide later which set combination works best. Give each camera a Name left to right A cam, B cam, C cam:
AB = 35mm IO
BC = 35mm IO
AC = 70mm IO
MultiPlate 3×3 offers 9 camera mounting positions 3 rows across and 3 rows down. Cameras mount to plate at proper Spacing of 2.75 inches (70mm with 35mm center) Turned 45˚ corner to corner spacing is 4 inches (100 mm with 50mm center)
If you’re gonna do it, shoot it. If you’re gonna shoot it, shoot it in 3D.