Looking closely at what happens on the inside of a DSLR and how a focal plane shutter works is quite fascinating. The Slow Mo Guys did just that when they posted a new video on Youtube showing us what happens in slow motion when a DSLR fires.
A DSLR works by using a mirror and prism system so that the person can see what the lens sees. When the picture is taken, the mirror moves up, the shutter curtains open, close and the mirror flips back down. They then compare different shutter speeds at slow motion.
What would have been really cool would be if we could see how second curtain flash sync works.
The video is after the jump.