Can I stitch just 2 or 3 cameras on Sphere?

It is possible to use fewer than the maximum number of physical video input / cameras sources on each Sphere for stitching purposes.

For example:

• a single Sphere could use just 2 or 3 cameras instead of the maximum of 4 inputs
• two Spheres combined together into a single rig could use just 5, 6 or 7 cameras instead of the maximum of 8 inputs