METIS is one of the three first instruments for the European Extremely Large Telescope (ELT), Europe’s next-generation ground-based telescope for optical and infrared wavelengths which is currently under construction at the ESO site at Cerro Armazones in Chile. METIS is the Mid-infrared ELT Imager and Spectrograph. This instrument will offer imaging, coronagraphy and medium-resolution spectroscopy over the full wavelength range from 3 to 14 microns, and high-resolution integral field spectroscopy as well as long-slit spectroscopy in the wavelength range between 3 and 5 microns. The main METIS science goals are the detection and characterization of exoplanets and the investigation of proto-planetary disks and the formation of planets. Max-Planck-Institut für Astronomie is involved in the METIS project, having two main work packages under its responsibility : the IMAGER and the Single-Conjugate Adaptive Optics. Conchi Cardenas is the optical designer of those subsystems, and she will present an overview of them, as they are after the Preliminary Design phase: the functionality, the role within METIS, but also how the two optical subsystems have been designed.