Roll Camera

Rotates the camera about the horizontal plane.

Reference

This button replaces the Zoom Extents button when a camera viewport is active.

Drag the mouse horizontally to roll a target camera or rotate a free camera about its local Z axis.

How To

To roll a camera or spotlight

1. Activate a Camera or Spotlight viewport.
2. Click Roll Camera/Spotlight.
3. Drag horizontally to roll the view.