| Clue | Source | Date |
|---|---|---|
| Carl -, optical instruments manufacturer established in Jena, Germany, in 1846 (5) | Mirror Quiz | 31 Jul 2025 |
| Carl -, optical instruments manufacturer established in Germany in 1846 | Mirror Quiz | 05 May 2025 |
| Carl --, 1816-88, German optician and industrialist | The Telegraph General Knowledge | 24 Jun 2018 |
| Camera man is captivated by extremes of excess | ||
| Famous name in optical instruments. |