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of this speed, the 8-mm. film can reproduce only a correspondingly limited range of frequencies.
Better sound quality results if you record and reproduce 8-mm. film at 24 f.p.s. The linear speed is then 3-6 inches per second which gives reasonable quality of speech and makes possible the recording of certain kinds of music.
So if you are going to use stripe in 8 mm., you should shoot and project your films at 24 f.p.s. Do not forget to open your camera lens aperture by half a stop to off-set the reduction in exposure time at the higher speed.
On 9*5 mm. and 16 mm. you can get good sound quality even at 16 f.p.s. The linear speed — 4-8 inches per second — is sufficient for good quality speech and quite good music. But here again, better results are produced at 24 f.p.s. The linear speed then rises to 7-2 inches per second and the quality is almost identical with that of a tape recorder running at 7-5 inches per second. At this speed your sound track will do full justice to any speech or music you are likely to record.
Of course the increased film speed adds to your film costs since you need 50 per cent, more film for a given time.
Whenever possible shoot a film at the speed at which you project it. If you want to project at 24 f.p.s., run the camera at this speed. Some cameras run at only one speed, however. You must then choose between two alternatives:
1. Shooting at 16 f.p.s. for \\ times the normal time.
2. Having the camera speed re-set at 24 f.p.s. There are objections to both these methods.
If there is any action on the screen, it will be speeded up when projected at 24 f.p.s. You have seen this effect when historic newsreels have been shown at the professional cinema. You can minimise the effect by avoiding violent action and asking people to walk slowly.
Every camera has a governor to control the speed. In a single-speed model, this may not be accessible from the outside. But a camera repair agent could re-set the governor to increase the speed, possibly as far as 24 f.p.s.
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