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Hey. If I don't have a person on hand to block my shot, I've tried to use the method of letting the ball hit a wall once it comes off the table and checking how much it rolls forward to measure topspin, but I've deemed it a bit unreliable. If the wall is irregular, or very rough or very smooth...

Hi everyone, firstly, Happy Chinese New Year :D Recently, I have been recording myself in training and games for self improvement as well as sharing with friends on youtube. However, I have noticed that with my camera, it will automatically stop recording at 10 min mark. My dad's video camera...