Cut-ins

It magnifies something the audience has already seen. The hand that was in the wide shot, now large enough to watch, without ever leaving the scene.

That containment is the value. A cut-in adds detail and keeps the geography intact, so the scene tightens without anyone losing their place.

Tight on part of the subject or part of the action already in frame, matched to the wider shot for light, position and movement.

Matching the action is what makes it invisible. If the hand was turning a dial in the wide shot, it is still turning at the same speed and in the same direction in the cut-in.

Use it to emphasise a gesture, to show what someone is doing with their hands, and to shorten a long action by cutting to a detail partway through.

Skip it when the detail is not already in the wider frame. Introducing something new this tight confuses the audience about where it came from.

An insert usually arrives from outside the scene and exists to deliver information. A cut-in comes from inside the action you are already watching.

A cutaway leaves the action. A cut-in stays in it. That single line decides which of the three names applies.

The detail comes back from a different scene: wrong sleeve, wrong light, wrong surface. Describe the subject and the lighting in the same words you used for the wider shot.

The other failure is a detail with no motion. A cut-in of a still hand cuts badly against a moving wide shot, so name the action and its direction.