PF330 Floodflash Flashbulb Light Output Graph |
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Time in seconds |
Guide for flood flash lamps |
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| Camera Speed | Frames | Guide Number for lamp to subject distance (inches) | |||
| Frames per Sec | Exposure | film exposure index Time *(sec) | |||
| ASA 15-25 | 50-100 | 150-200 | 250-300 | ||
| DIN 15-18 | 18-21 | 23-24 | 25-26 | ||
| 200 | 1/1000 | 82.1 | 116.0 | 177.3 | 222.3 |
| 300 | 1/1500 | 71.3 | 100.8 | 154.1 | 193.0 |
| 400 | 1/2000 | 58.1 | 82.3 | 125.7 | 157.4 |
| 600 | 1/3000 | 47.2 | 66.6 | 101.7 | 127.5 |
| 800 | 1/4000 | 41.1 | 58.1 | 88.8 | 111.1 |
| 1000 | 1/5000 | 36.7 | 51.9 | 79.2 | 99.3 |
| 1500 | 1/7500 | 32.0 | 45.0 | 68.8 | 86.2 |
| 2000 | 1/10000 | 25.9 | 36.7 | 55.9 | 70.0 |
| 3000 | 1/15000 | 21.2 | 30.0 | 45.8 | 57.5 |
| 4000 | 1/20000 | 18.3 | 25.9 | 39.6 | 49.6 |
| 5000 | 1/25000 | 16.5 | 23.5 | 35.8 | 44.7 |
| 6000 | 1/30000 | 15.0 | 21.2 | 32.4 | 40.7 |
| 7000 | 1/35000 | 13.9 | 19.7 | 30.0 | 37.8 |
| 8000 | 1/40000 | 13.2 | 18.6 | 28.4 | 35.6 |
| * Based on one fifth x the reciprocal of frames per second. A smaller aperature opening of one-half f-stop should be used with cameras, calculating the exposure time as one third x the reciprocal of frames per second. | |||||
| To find the f-stop, divide the guide number by the lamp to subject distance in inches. | |||||
| For metric, multiply the guide number by 2.54 and divide by the lamp to subject distance in cm. | |||||
©Meggaflash Technologies Ltd. |
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