In the case of slot cars you are trying to capture small objects that are moving rather quickly and that is not easy under the best of circumstances. No matter how expensive and sophisticated your equipment may be you will not be likely to get good videos if the lighting is poor. The first thing to try is to go for more light and it will not hurt to hold the cell phone as steady as possible. If that does not work well enough you will have to go for at least a digital camera that can shoot videos.
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