This add-on brings dolly zoom functionality to the viewport, allowing users to adjust the scene camera's focal length dynamically while maintaining the relative size of the subject. This technique is useful for experimenting with different perspectives and camera angles without needing to manually balance position and focal length.

The tool is activated via a hotkey and driven by horizontal mouse movement. Users can toggle the focal point between the active object and the 3D cursor, use keyboard modifiers for fine adjustments, or type specific numbers to set exact focal lengths. It is designed to assist setup and framing in the viewport, and does not record keyframes for animation.