Camera Shots and Continuity Editing
180 degree rule
The 180 degree rule mainly to establish/maintain the screen direction of the actors or action within a scene. This makes scenes easier to follow because the angles used by the camera follow a specific guideline that prevents the audience from getting confused.
The line of action is used in the 180 degree rule as a space to show where the camera is able to move.
During the 180 degree rule, the viewers are usually given an establishing shot to give basic geography of the scene and secondly determines the screen direction of the actors.
If the camera does not go over the line of action, then it has successfully completed the 180 degree rule.
Here is an example of how the 180 degree rule is used.
Shot reverse shot
shot reverse shot is a technique where one character is seen looking at another character, this second character is then show looking "back" at the first character. Since the characters are shown facing in opposite directions, the audience automatically assumes they are looking at each other.
Shot reverse shots are usually set up with three camera angles. One of both of the characters, one of an over the shoulder shot of character 1, and the same of character 2.
By constantly switching from one character to the other, we are creating a shot reverse shot. It is important to realise that a characters reaction is just as important as the speech, which is why shot reverse shots are used. An example is below,
Match on action is used to allow a scene to continually flow. It is known as a change in perception of the camera without disrupting the scene to enhance the audience's understanding.
This example from youtube of match on action shows at 0.24 seconds where the camera changes shots to see more closely at the dominant character of the scene lighting a match. The camera doesn't disrupt the scene because the subtle change of perception allow the scene to follow on through.