Mechanical mirror shutters are useful if you want an optical viewfinder like in the Arri D21 or a mechanical shutter with a sissor action like in the Sony F65 but the disadvantages are the sweeping action, bulk, heavy weight and sucks power. there's some vibration and noise although minimised. they are very precise and are expensive to build. but the advantage of having them outweighs the costs. is there a better system. a system that is instant, small, light weight, draws minimum power, very fast, no noise, no vibration, cheap and placed in front of the OLPF ? what am i talking about? well, how about a LCD shutter? without the back light, of course, and at 2ms switching either on or off across the full frame in an instant capturing the image. sure they will have to be custom made and the crystals a little larger so they overlap when closed cutting out all light. surely the engineers can design this. i suppose one can call this a mechatronic shutter and base on the principal, it can work well. one can argue "well, there's one more refraction we have to consider in the optical path". but let the engineers work this out. if the glass is completely flat, thin and the liquid clear, then we are on our way to have this a reality.