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Assuming that the monitor is all it should be we must next consider the recording camerao |
Never before has the requirement been placed on the motion picture camera that it shall run for long periods of time without cleaning. Hollywood practice is to take a one or two minute scene and then clean the camera gate and proceed. This is because in most motion picture cameras a pressure shoe is used to hold the film securely against the back plate when the film is in the camera aperture. This is done to assure that the film is perfectly flat and that the picture image will be in focus. These pressure shoes, unless very skillfully designed, will chip off bits of the emulsion. These chips often cling to the shoes and build up a hard bump which will scratch the film. Most recording cameras today have dealt successfully with this problem. One company in particular, has dealt with the problem by eliminating it. No pressure shoes are used. Instead there are holes in the back plate to which suction is applied, holding the film in a flat plane by this methodo Thus, the emulsion never touches anything in going thru the camerac
There is one other trick in video recording which is important. The television image occurs at a frame rate of 30. A motion picture must be made at a frame rate of 2h. This is accomplished by recording one television frame and then throwing away one-fourth of the next frame so far as time is concerned. During this period the film camera pulls down the film for the next frame exposure. One-fourth of a television frame is 1/120 of a second which is very little time indeed. This means that the camera pull down mechanism in a recording camera has to be very rapid and this again contributes to vibration.
In some cameras a mechanical shutter is used to cut off the light from the film while the film is in motion. This shutter has to be very carefully adjusted or otherwise there will appear in the picture a faint horizontal line which we know as the splice line. One manufacturer gets around this by eliminating the shutter. The cathode ray tube is turned on and off at appropriate intervals. This can be
readily done because in electronics these phenomena can be controlled in terms