Nodes
Tripod Track
Solve rotation-only shots where the camera never moves.
For shots where the camera rotates but doesn't travel. Pans, tilts, nodal moves.
A normal solve needs parallax, the way near things shift more than far things as the camera moves. A camera that only rotates produces none, so there's no depth to recover and Auto Track has nothing to work with. This node solves rotation only and skips the problem.
Takes Image Sequence, outputs Camera Data.
Settings
Frame Step solves every Nth frame and lets Blender interpolate the rest. Higher is faster. Defaults to 2.
Features is SIFT features per frame, defaulting to 4000.
Match Range matches each frame against this many neighbours either side. Wider gives a steadier focal length and takes longer.
Reference Radius is how far away the reference points are placed. Nodal pans have no real depth, so this is arbitrary and only affects how the points look in your scene.
Output
Camera Data connects to Output 3D's Camera input, not Scene.