Minimum camera angle shift between cuts — less than 30° creates jump cuts that disorient viewers. Beyond 30°, the cut reads clean and intentional.
You cut two shots of a character in succession—and suddenly they jump on screen. The audience registers that something is wrong without consciously knowing why. The camera hasn't moved enough. This is precisely where the 30-degree rule comes in: between two consecutive cuts of the same scene, the camera position must change by at least 30 degrees, otherwise the cut appears as a jump cut—unplanned and disruptive.
On set, it works like this: you shoot the first shot from position A, then you reposition the camera by at least 30 degrees to position B. This angle is large enough for the eye to accept the change in perspective—the spatial shift is clearly recognized. If you fall below this minimum angle, the composition remains too similar. The viewer sees the same character from virtually the same perspective, just slightly shifted. The brain doesn't interpret this as a new camera angle, but as a continuity error—as if the person had moved imperceptibly without time passing.
In practice, this is a rule of thumb, not a physics constant. With good editing rhythm, sound design, or editing effects, you can also cut below 30 degrees—but it then requires compensatory measures: a sound cut masks the jump, a clear cut to a close-up makes the change in perspective visually more intense, or you have the character perform an action between shots (raising their gaze, a head movement) that justifies the spatial jump. This is called a motivated cut.
Conversely: if you deliberately cut below 30 degrees and don't use any of these tricks, it works as a stylistic statement. Haneke, Godard, or Jarmusch use precisely such irritating micro-cuts as an aesthetic device. The rule is not sacred—it is a tool. You need it to know when and how you can break it. However, in classic dramatic editing or documentary storytelling: adhere to it. The cut becomes invisible, and that is precisely the goal.