| get smaller | 0.51 |
| control the amount of l… | 0.48 |
| remain open | 0.46 |
| control depth of field | 0.43 |
| affect depth of field | 0.41 |
| allow more light | 0.38 |
| let light | 0.35 |
| extend through the subs… | 0.35 |
| close to maintain prope… | 0.34 |
| refer to the amount of … | 0.32 |
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| nine blades | 0.37 |
| shape | 0.25 |
| direct impact | 0.25 |
| hole | 0.50 |
| the opening | 0.46 |
| the size of the hole | 0.34 |
| set | 0.71 |
| expressed in f-stops | 0.56 |
| closed | 0.54 |
| controlled by the camera | 0.54 |
| adjusted | 0.49 |
| selected | 0.48 |
| easy to use | 0.45 |
| designed to be comforta… | 0.44 |
| set to f/11 | 0.42 |
| marked on both sides of… | 0.41 |
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