| Accidental pinhole and pinspeck cameras: Revealing the scene outside the picture Recent countries visiting this post |  |
 | 30 | |
 | 7 | United States |
 | 3 | China |
 | 3 | Germany |
 | 1 | Italy |
| Accidental pinhole and pinspeck cameras: Revealing the scene outside the picture Recent countries visiting this post | |
| 30 | |
| 7 | United States |
| 3 | China |
| 3 | Germany |
| 1 | Italy |