I've recently found myself shooting a lot of photos on the maximum speed that my camera (a Canon 600D) allows (1/4000). This is quite extreme when thinking about mechanical movements, so I assumed that the digital shutter must be used at that speed. What is the maximum speed that is possible for the mechanical movements and where does the electronic shutter kick in if at all?
P.S. My brain also tells me that there is a possibility that with the amount of light available and the speed being so high that the entire sensor might not actually have to be fully exposed( at one time) to the light source but that a small slit between curtain 1 and 2 should be sufficient.