| Year | 1952 |
| Date | 31-Jan |
| Volume | 106 |
| Issue | 2,645 |
| Page | 143 |
| Category | Photographic |
| Part | |
| Title | Camera Design. An article of great importance for those interested in photography |
| Author | Raymond F.Stock |
| Notes | Operating principle of iris diaphragm, typical rack focussing, focussing, helical focussing mount, shutters, iris shutter |