| Clue | Source | Date |
|---|---|---|
| Lens figure | Wall Street Journal | 29 Nov 2022 |
| Distance between camera lens and film or image sensor | The Times Specialist Sunday | 28 Jan 2018 |
| It's variable with a zoom lens [Ginsberg] | Premier Sunday | 03 May 2015 |
| It's variable with a zoom lens [Ginsberg] | ||
| Telescope measure |