Micro-optics and Optical MEMS refer to a wide range of devices and methods that allow us to manipulate light at the wavelength scale with unprecedented precision and speed. Emerging from modern microsystems technology, they are at the heart of countless compact yet versatile optoelectronic systems such as fiber optic telecommunications networks, LIDAR, adaptive optics and endomicroscopy. MICRO605 is a comprehensive tour of the rich world of passive and active micro-optics, covering the subject from its fundamentals to its most exciting applications.