The 30° rule is a basic film editing guideline that states the camera should move at least 30° between shots of the same subject occurring in succession. This change of perspective makes the shots different enough to avoid a jump cut. The transition between two shots less than 30 degrees apart might be perceived as unnecessary or discontinuous--in short, visible. The rule is actually a special case of a more general dictum that states that the cut will be jarring if the two shots being cut are so similar that there appears to be a lack of motivation for the cut. The new shot in this case is different enough to signal that something has changed, but not different enough to make us re-evaluate its context. Following this rule may soften the effect of changing shot distance, such as changing from a medium shot to a close-up.
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