Mathematics

To accomplish the aftereffect the camera needs to be positioned at a assertive ambit from the article that is declared to abide still during the barrow zoom. The ambit depends on how advanced the arena is to be filmed, and on the acreage of appearance (FOV) of the camera lens. Before artful the distances bare at the altered fields of view, the connected amplitude of the arena has to be calculated. For example, a FOV of 90° and a ambit of two meters crop a connected amplitude of four meters, acceptance a four-meter-wide article to abide still central the anatomy during the effect.

\mathrm{distance} = \frac{\mathrm{width}}{2\tan\left(\frac{1}{2}\mathrm{fov}\right)}