A zoom lens lets you vary focal length within a designed range.
Adjust framing quickly when movement or lens changes are inconvenient.
Optical zoom changes the field of view. A zoom may have a fixed or changing maximum aperture across its focal-length range.
Stand in one place and compare wide and tight compositions before choosing a frame.
Zooming and changing camera position produce different spatial relationships. Check the lens aperture limits as you zoom.
Follow a connection to understand how these ideas fit together.
A prime has a single focal length; a zoom can change focal length within a range.
This comparison works in both directions.
Operating optical zoom selects another focal length within the lens range.
Zooming changes how much of the scene fits without moving the camera.
A zoom lens has an aperture; some zooms change maximum aperture through their range.
Source check: . This records a check of the supporting references; it is not an expert endorsement.
Optical zoom changes the field of view. A zoom may have a fixed or changing maximum aperture across its focal-length range.