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Why then has the kinescope recording taken second place?
This is a matter of quality. There has been a constant struggle to improve this recording process to a point that its utility is unquestionede
Most of you are fully aware that a television image is made up of a series of lines and therefore its resolution in a vertical direction is limited by this line structures In practice this figure comes out to be something over OO lines. In the horizontal direction, the resolution can be better and is only limited by the ability of the engineer to make the scanning beam finer to resolve additional detaile It is common in good studio practice to achieve a resolution equal to 600 lines in the horizontal direction. This is about the best that one can do with the present standards of television.
How then does this resolution capability compare with motion picture?
It can be proved that a 16mm reversal fiim can resolve detail a little better than the best that television can delivere 35mm film can resolve a good deal moree Therefore, if everything is working properly we can record all of the information in a television image on either l6mm or 35mm film by the use of proper cameras and proper recording monitorse
When the kine recording is played back thru a television system and re-broadcast it can be shown that some of the detail present in the film will be lost because the scanning beam of the pickup tube — occassionally scan partially in between the lines of the recorded image on the motion picturee In practice a figure of 70% is a measure of the success of re-transmitting kine recordingse This is the reason why a kine recording must, for a long time, look a little worse than a good direct television image.
As between the use of 16mm film and 35mm film theoretically there is very little to choose, practically there is much to choose.
A 35mm film has so much more area and is capable of so much more resolution that if this be taken as 100% and we try to record a television picture output
which has an efficiency of 70% or so, 70% of this 100% turns out better than 70%