This week I explain shutter lag and how it affects high speed photography. The main message this week is that shutter lag at around 100ms is 1000x longer than flash duration. So for high speed photography people need to often use an external flash rather than relying on a shutter. This is usually accomplished by using bulb mode on your camera in a dark room and using a photo trigger like the Camera Axe to trigger the flash at the instant needed to capture the photo.
More info about flash duration: