This lens (or its predecessor) is a standard item in cine rental houses. It ships in a box that looks very similar to a coffin. We used to joke that the box was for the camera assistant (focus-puller) at the end of the shoot. : ) In practice, the focus puller gives over the job to the operator. Focus under these conditions is pretty well the camera operator's job.
Following action at this degree of magnification demands the utmost from the operator and the support equipment. The lightweight Sachtler head shown in the video, while possibly adequate for stills, would be hopeless for motion picture work. Once you mount a 35mm film camera to that lens, the entire package quadruples in weight compared to the DSLR shown. A heavy Sachtler head cost over ten large in the late eighties and was worth every penny.
Even this lens pales compared to the lenses Canon provides for TV sports work. Next baseball season, watch carefully the operators' work on the closeup center field camera. These guys hold a chest shot on the batter from straightaway center field. That's usually close to 400 feet away. : (
