The 180 degree rule is when the camera only stays one side of a 180 degree when filming things such as conversations this rule is an essential rule in the media industry as if you record a conversation but decide to cross 180 line characters eyes will not line up and it will look like the characters are sitting in the same place.
This picture shows the 180 degree rule
The shaded blue part of the the picture the half in which the camera must stay through out the whole scene the camera can move anywhere In this section but cannot cross the axis of action
If the camera man does indeed want to change to the other side of the line he must record this transformation and include in the scene. if he wants to move back to the other side, he must do the same again.
Please view the video at the bottom for a detailed explanatiation
Match on action is another rule in which gives the viewer a much bigger picture of what is happening in the scene. match on action is when a editor cuts from one shot to another view that matches the first shots action. This is commonly used when someone is walking up to a door and pushes the door handle. The camera angle will change twice but the actor will keep action throughout
Match on action is another rule in which gives the viewer a much bigger picture of what is happening in the scene. match on action is when a editor cuts from one shot to another view that matches the first shots action. This is commonly used when someone is walking up to a door and pushes the door handle. The camera angle will change twice but the actor will keep action throughout
This image shows the match on action technique being used. As you can see from the image the camera and shot angle changes three time through out the scene even though the character is performing the same thing.
Please click the link below to see a detailed example and explanation of match on action

This image shows two characters having a conversation as you can see the cameras have been placed in similar positions to the cameras in the 180 degree rule therefore it looks the characters are making direct eye contact and actually having a conversation. the same rules apply to this rule if the camera crosses the line.
The video below shoes and explains shot reverse shot and how vital it is when characters are having a conversation.
180 degree video
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