Source: https://www.sigma-global.com/en/wp/wp-content/themes/sigma/tool/download.php?lang=en&filepath=https%3A%2F%2Fwww.sigma-global.com%2Fen%2Fwp%2Fwp-content%2Fdownload%2Fcatalog-resource%2Flenses%2Fcontemporary%2F100_400mm_F5_63_DG_DN_OS_C020.pdf