Almost a century and a half of optical engineering: from taking lenses to sunglasses; from Rodenstock to Linos to Qioptiq to Excelitas.
Rodenstock lenses and lens cells can be dated as follows:
| 50 000 | 1910 |
| 200 000 | 1920 |
| 400 000 | 1930 |
| 700 000 | 1935 |
| 900 000 | 1938 |
| 950 000 | 1940 |
| 2 000 000 | 1945 |
| 2 500 000 | 1952 |
| 3 000 000 | 1954 |
| 5 000 000 | 1961 |
| 6 000 000 | 1966 |
| 7 000 000 | 1971 |
| 8 000 000 | 1973 |
| 9 000 000 | 1974 |
| 9 500 000 | 1977 |
| 10 000 000 | 1979 |
| 10 500 000 | 1984 |
| 11 000 000 | 1991 |
| 11 150 000 | 1993 |
| 11 231 713 | 1994 |
| 11 294 073 | 1995 |
| 11 358 165 | 1996 |
| 11 407 513 | 1997 |
| 11 468 541 | 1998 |
| 11 521 123 | 1999 |
| 11 588 264 | 2000 |
| 11 649 679 | 2001 |
| 11 678 274 | 2002 |
| 11 724 136 | 2003 |
| 11 767 376 | 2004 |
| 11 805 455 | 2005 |
| 11 860 241 | 2006 |
| 11 926 199 | 2007 |
| 11 944 338 | 2008 |
| 11 944 338 | 2009 |
| 12 022 600 | 2010 |
| 12 055 439 | 2011 |
| 12 095 376 | 2012 (Serial numbers after 2012 belong to Linos and Qioptiq) |