Angles and camera shots communicate the feelings and ideas that the director wants too portray to the audience, gets the camera angles exactly correct is very important because having a different shot too what the director wants will mean redoing the shot at the right angle. for example a MCU (medium close up) would be goof for showing basic emotions because you see the facial features but a shot like an XCU (extreme close up) is better for the more intense emotions and structure of the actors face.
The 180 degrees rule is the rule that while two people are talking face too face the camera cannot go more that 180 degrees from it's origin point of the shot, this is because that when you have an over the shoulder shot and the go too the opposite shoulder of the other character, the audience will become disoriented. This rule is mainly applied to "over the shoulder shots" which is a shot that while most commonly appear during a dialogue scene of importance or a static scene with a lot of dialogue as they are the most popular style of shot when two characters are in a linear pathway too each other.
When establishing a scene it is always wise too maybe start with a wide shot, it establishes the scenery and the shot area for the later cuts or you could do a Bravura shot technique (example from "Touch of Evil") which is a continuous shot with no breaks or cuts for the entirety of the shot; it is a long tracking shot which is hard too pull off, even harder too pull off when all of the extra's in shot have too be perfectly timed.
The order when filming on set is as following:
"Quiet on Set" from the Director
the Director must make sure that all of the crew, actors and extras are all quiet so the beginning of the sound recording is blank so it is easier to edit later on
"Roll Sound" from the Director
the sound is rolled first because the actual film was more expensive so if you were too start filming first you'd be burning money away
"Sound rolling" from the Sound engineer/recordist
the sound operator needs to notify the Director directly so that with the quiet on set they can hear any orders or problems straight away
"Roll film" from the Director
this is the instruction from the director to the camera operator too start rolling the film
"Camera speed" from the Camera operator
this means that the camera is rolling and any movement is caught on the camera
"Marker" from the Director
this is an oprder from the director too the clapper, so that when the clapper sounds both the sound and the camera capture the clapper noise to signify the start
"Shot/take" Clapper sounds, starts the shot
the clapper board has the ability to capture visually and audibly
"Action" from the Director
this is so the actors know this is when too practically start
bibliography
https://www.youtube.com/watch?v=Yg8MqjoFvy4
