The 180 degree rule is a filmmaking guideline that states that during a scene with two characters, the camera must stay on one side of an imaginary line between the characters known as the 180 line. This helps orient the viewer by keeping the characters in the same left/right relationship. While the camera can move, it must not cross the 180 line. Following this rule helps keep the characters at eye level and avoids confusing the audience. The 180 degree rule is especially important for scenes where two characters are having a conversation, but does not need to be followed for situations like filming sports.

1. Film Techniques
By Paula Duru

2. 180 Degree Rule
Definition - The 180° rule is a film
making guideline that states that
two characters (or other elements)
in the same scene should always
have the same left/right relationship
to each other.

3. This is 180 Degree Rule
180 Degree rule orients the viewer.
When a character is on the left hand side and one is on the right, the camera must
stay on 180 line.
The camera can be aimed at any direction. But must stay on 180 degree line.
This is so the two characters are at eye level. Violating the 180 degree rule can
confuse audience.

4. Why do you need to use 180
degree rule?
The 180 degree rule certainly doesn't apply in all situations. If you're filming two people
talking to each other, then yes, it is useful to apply it.
You do not have to use the rule in all cases like during sports.
It is much better use when 2 people are having a conversation.

6. Two shot from “Hard Candy”
http://www.youtube.com/watch?v=L3myRRZkE

8. http://www.youtube.com/watch?v=QLkUHZ1qips&feature=player_embedded

12. http://www.youtube.com/watch?v=laUPi7MPOSQ

13. http://www.youtube.com/watch?v=4ZCaJDTv65o

14. http://www.youtube.com/watch?v=VwFq-wtvRzY&