Complete optical layout of EST. The telescope delivers the focal plane F3 to the instruments after passing the MCAO set of deformable mirrors (DMs) and the Pier Optical Path (POP) system. The VIS and IR labels define whether an arm samples the visible or infrared parts of the spectrum, with the former applying to the wavelength range from 380–680 nm and the latter applying to the wavelength range from 680–2300 nm.