ELi5 How a cameraman at a sports event able to track a fast moving ball with such a great focus on it?
In: 2760
It all comes down to having a parfocal lens. A parfocal lens enables the camera operator to quickly zoom in and out without losing focus. It also needs a motorized aperture and focus remote control.
[Here is a great video explaining how this is possible.](https://youtu.be/RkTaMyatsTo) There is actually more to it aside from the lens.
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