< Modern Photography
Studio delta EV Contrast ratios
| ΔEV | Contrast |
|---|---|
| 1.0 | 1:2 |
| 1.6 | 1:3 |
| 2.0 | 1:4 |
| 2.3 | 1:5 |
| 2.6 | 1:6 |
| 2.8 | 1:7 |
| 3.0 | 1:8 |
| 3.2 | 1:9 |
| 3.3 | 1:10 |
Studio flash ratios
| Ratio | f/5 | f/5.6 | f/6.3 | f/7.1 | f/8 | f/9 | f/10 | f/11 | f/13 | f/14 | f/16 | f/18 | f/20 | f/22 |
| f/6.3 | 1:1.5 | 1:1.5 | - | 1:1.5 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.0 | 1:4.5 | 1:5.0 | 1:6.5 | 1:8.0 | 1:10.0 | 1:12.0 |
| f/7.1 | 1:20 | 1:1.5 | 1:1.5 | - | 1:1.5 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.5 | 1:4.0 | 1:5.0 | 1:6.5 | 1:8.0 | 1:9.5 |
| f/8 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.5 | - | 1:1.5 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.0 | 1:4.0 | 1:5.0 | 1:6.5 | 1:7.5 |
| f/9 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.5 | - | 1:1.0 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.0 | 1:4.0 | 1:5.0 | 1:6.0 |
| f/10 | 1:4.0 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.0 | - | 1:1.0 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.0 | 1:4.0 | 1:5.0 |
| f/11 | 1:5.0 | 1:4.0 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.0 | - | 1:1.5 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.5 | 1:4.0 |
| f/13 | 1:7.0 | 1:5.5 | 1:4.5 | 1:3.5 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.5 | - | 1:1.0 | 1:1.5 | 1:2.0 | 1:2.5 | 1:3.0 |
| f/14 | 1:8.0 | 1:6.5 | 1:5.0 | 1:4.0 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.0 | - | 1:1.5 | 1:1.5 | 1:2.0 | 1:2.5 |
| f/16 | 1:10.0 | 1:8.0 | 1:6.5 | 1:5.0 | 1:4.0 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.15 | 1:1.5 | - | 1:1.5 | 1:1.5 | 1:2.0 |
| f/18 | 1:13.0 | 1:10.5 | 1:8.0 | 1:6.5 | 1:5.0 | 1:4.0 | 1:3.0 | 1:2.5 | 1:2.0 | 1:1.5 | 1:1.5 | - | 1:1.0 | 1:1.5 |
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