Magnification correction for small field scanning of large blanks is provided by adding magnification adjusting elements (lenses) to a double pass Wynne-Dyson lens or other type of one-to-one projection lens. The magnification adjusting optical elements includes two pairs of low power lenses,...http://www.google.de/patents/US5739964?utm_source=gb-gplus-sharePatent US5739964 - Magnification correction for small field scanning
