In manual mode. you can determine the correct flstop using the following equation:
flstop =
See table below for the guide number at various film speed.
| Guide number at various film speed |
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| Light |
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| Underwater shooting |
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| output | 18025 | 50 | 64 | 100 | 200 | 400 | 800 | 1000 | ||||||
| M Full | 8 (26) | 11 (36) | 12 | (39) | 16 | (53) | 22 (72) | 32 | (105) | 45 | (148) | 50 (164) | ||
| M 1/4 | 4 (13) | 5.6 | (18) | 6 | (20) | 8 | (26) | 11 (36) | 16 | (53) | 22 | (72) | 25 (82) | |
| M 1/16 | 2 (7) | 2.8 (9) | 3 | (10) | 4 | (13) | 5.6 (18) | 8 | (26) | 11 | (36) | 12 (39) | ||
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| m (tt) |
I | Light |
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output | 18025 | 50 | 64 | 100 | 200 | 400 | 800 | 1000 | |||||||
M Full | 16 (52) | 22 | (72) | 25 (82) | 32 | (105) | 45 | (148) | 64 | (210) | 90 | (295) 101 (331) | |||
M 1/4 | 8 (26) | 11 (36) | 12 | (39) | 16 | (52) | 22 | (72) | 32 | (105) | 45 | (148) | 50 (164) | ||
M 1/16 | 4 (13) | 5.6 | (18) | 6 | (20) | 8 | (26) | 11 | (36) | 16 (52) | 22 | (72) | 25 (82) |
_ Caution
-Guide numbers under water vary according to water conditions.
-When aiming the Speedlight diagonally. open the aperture 1/2 to 1 step wider (smaller
above equation to compensate for the different angle of reflection . _ When taking photographs with the arm removed from the bracket .
Nikon recommends you to take various pictures with different apertures by adjusting the
• Important
If the
For example. if the actual
44