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•Flash shooting distance range
Flash shooting distance for the
ISO film speed | 25 | 50 | 100 | 200 | 400 | 800 | Flash shooting |
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Guide number (m/ft.) | 6/20 | 8.5/28 | 12/40 | 17/56 | 24/79 34/12, | (m/ft.) | I | |
| - | - | 1.4 | 2 | 2.8 | 4 |
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| - | 1.4 | 2 | 2.8 | 4 | 5.6 |
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| 1.4 | 2 | 2.8 | 4 | 5.6 | 8 |
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Aperture value | 2 | 2.8 | 4 | 5.6 | 8 | 11 |
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| 2.8 | 4 | 5.6 | 8 | 11 | 16 |
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| 4 | 5.6 | 8 | 11 | 16 | 22 |
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| 5.6 | 8 | 11 | 16 | 22 | 32 |
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| 8 | 11 | 16 | 22 | 32 | - |
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•The maximum flash shooting distance can also be calculated by dividing the guide number by the selected aperture value.
Example: When f/2.8 is selected with ISO 100 film using the camera's
12/2.8 = approx. 4.2m or 40/2.8 = approx. 14 ft .
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