What does the zoom ratio describe?

The zoom ratio describes the range between the shortest and longest focal lengths of a zoom lens. This measurement provides information about how much the lens can magnify an image compared to its minimum focal length. A higher zoom ratio indicates that the lens can cover a broader range of focal lengths, allowing for greater versatility in framing and composition. For instance, a lens with a zoom ratio of 10:1 can transition from a very wide angle to a much tighter shot, enabling the filmmaker to adapt to various shooting situations without changing lenses.

This aspect is crucial in video and film production, as it influences how a scene is captured and how visual storytelling is executed. Focal lengths directly affect perspective, framing, and composition, which in turn can alter the emotional impact of the footage. Understanding this concept helps production teams make informed decisions about equipment that best suits their projects.