This low poly model is one of the 60+ 3d assets included in the LightArchitect pre-visualization add-on for blender 3d. It is based on the Arri Alexa XT digital cinema camera. One of the best camera's used to shoot movies in Hollywood and around the world.
Note that this 3d model is only the camera. To get the full film pre-visualization add-on use this link: https://www.blendermarket.com/products/lightarchitect---filmmaking-add-on