How it works
Increase focal length while the camera position stays fixed.
Terminology boundary: Aliases vary by region and production context; the physical parameter above is the deciding clue.
04 · Lens and focus
Zoom in镜头变焦拉近
Increase focal length while the camera position stays fixed.
Physical change: focal lengthoptical zoom
Narrative effect
Magnifies without dolly-like parallax.
When to use it
Details, broadcast, surveillance, snap zooms.
Common mistakes
Keep position fixed; avoid soft digital enlargement.
SHOT PROMPT TEMPLATE
Turn the term into direction
Optical zoom wide to medium in 2 seconds; no camera translation.