Zoom
zoom inzoom outslow zoomsnap zoom
A zoom shot changes focal length without moving the camera. Space flattens or opens with no parallax: near and far grow or shrink together because the nodal point stays put.
Narrative function
Change size without walking. Surveillance, emphasis, a punch: the glass does the work.
The background does not shear; it merely occupies more or less of the frame. If you need the room to be real, dolly.
The compound cousin is a dolly zoom, where travel and glass disagree on purpose. A zoom used as fake geography will flatten the set and give the cheat away.
How it works
Locked body, zoom lens, often on sticks. In flattens (more telephoto); out opens (more wide).
No near-object shear. Prompt: Zoom on [Subject], optical magnification, camera body still, space flattening or opening without parallax.
When to use it
Use it to change size from one stance: a watcher's glass, a snap to a face, a slow tightening. Do not label a dolly as a zoom.
Compared with similar shots
Slow Zoom In is the same axis at a crawl. Crash Zoom In is the punch.
A Dolly Zoom pairs opposite travel and glass so perspective warps. A Dolly translates and produces parallax.
In film
The Conversation uses optical magnification as surveillance, glass doing the watching. Jaws is famous for a dolly zoom, the other move: do not cite that beach shock as a plain zoom.
Prompt it
Keep the body still. Still: Zoom on [Subject], optical magnification, camera body still, space flattening or opening without parallax.
Video: The lens zooms on [Subject], no camera travel, space compressing. Say in or out.
Forbid wheels.
What usually goes wrong
The usual wrong cousin is a dolly-in. The tell: a lamp shears, a doorway slides, true parallax.
The fix: lock the camera, change only focal length, and let planes scale together.
Questions
What is Zoom in film?
A zoom changes focal length while the camera body stays put. Size changes; parallax does not appear.
Zoom vs Dolly
A dolly moves the camera through space, so near objects shear. A zoom only changes the lens, so the world scales as one card.
When should I use Zoom?
Use it to change size without walking: surveillance, a snap, a slow tighten. Do not use it to fake a walk through a room.
How do I prompt Zoom for AI image or video?
Write optical magnification and no camera travel. Example: Zoom on [Subject], optical magnification, camera body still, space flattening or opening without parallax.