Leaf-shutter lenses exist for flash use on focal-plane-shutter medium-format SLRs, with shutter speeds up to 1/1600s @ f/2.8; so they'd be possible for small-format cameras - possibly with full TTL ...
The Part 1 of this series about digital camera design has shown how to do the basic calculations that interrelate pixel size, focal length, focal ratio, and spot size, and demonstrated how these ...