 Its significance was not noted until several years later when Köhler was invited to join the Carl Zeiss AG company based on his invention.A century after its first publication, a translation of Köhler's original article, "A New System of Illumination for Photomicrographic Purposes", was reprinted in the "Köhler Illumination Centenary" commemorative issue by the Royal Microscopical Society in 1994.Today, the Köhler illumination is considered one of the most important principles in achieving the best optical resolution on a light microscope.