Unlike electronic switches, micro-mirror optical switches do not slow the signal down.

ECONOMIST: Reinventing Marconi

The mirror-less camera builds on its forbears, phasing out the mirror-based optical viewfinder of the SLR camera and adding an interchangeable lens mount, while keeping the light-weight feel of the compact camera.

FORBES: New Developments for the Camera Category

To do so, he dipped the end of an optical fibre into a bead of molten gallium, then allowed the gallium to freeze, creating the mirror.

ECONOMIST: Optical communications: Swish switches | The