Even if we are only shooting video occasionally, we need some information and one accessory that makes an enormous difference. There is a fundamental difference between shooting video and stills. It’s not just that video is moving pictures. The difference is due to the need to balance frame rate and shutter speed. If you get it wrong, then the video looks bad. A Lesson from Nature We think that many creatures perceive time passing more slowly than we do. That is because they have much faster nervous systems. The key mechanism for this is called temporal resolution. It can be measured using the critical flicker fusion frequency (CFF). That is the rate at which a flickering light appears steady to the animal. Humans perceive the world between 50 and 90 Hz; that’s 50-90 times per second. That’s why some people can see the flicker of older fluorescent lights oscillating at the rate of the alternating current here in the UK. Meanwhile, flies have a CFF of around 300 Hz.…