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R
ECORDING MENU
The output of the flash can be specified when using manual
flash control with power ratios.
Set the flash-control option in section 2 of the recording
menu to manual. The power ratio, also in section 2, can
then be selected. See page 64 for menu operation.
17 / 56 24 / 79 34 / 112
48 / 157
The chart lists approximate guide numbers for manual flash calculations. The following
equations are useful in determining the guide number, aperture (ƒ-number), or flash-to-
subject distance required for exposures.
Guide no. (for distance in meters / feet)
Power
ratio
1/1 (Full)
1/4
1/8
200 400 800
Camera sensitivity (ISO)
8.5 / 29
6 / 20
12 / 39 17 / 56
17 / 56
12 / 39
24 / 79
8.5 / 29
1/2 12 / 39 17 / 56 24 / 79
34 / 112
1/16 4.2 / 14
12 / 39
8.5 / 296 / 20
12 / 39
100
6 / 20
4.2 / 14
8.5 / 29
3 / 10
Flash mode Fill-flash
Flash control Manual
Power ratio 1/1
Setup
0.3Ev/3frames
0.3Ev/3frames
Setup
Bracket order
MANUAL FLASH AND POWER RATIO
When the camera flash is raised, the power ratio is
displayed on the monitor.
Power ratio
Guide number = ƒ-number X distance
Distance = guide number / ƒ-number
ƒ-number = guide number / distance
68 / 223
3200
24 / 79
34 / 112
48 / 157
17 / 56
1600