Transform and scale objects along the selected (or current) cameras perspective line. Helps when building geometry from photos.
Ever composed a previz scene only to realise you had the camera's aperture size set incorrectly? Then this simple tool is for you. It creates a duplicate of the camera with which you can adjust the film back size without affecting the horizontal field of view. Works by modifying the focal length.
Export a locator's animation (in camera space) to a shake tracker.