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Twin Flash light ratio setting
When using both flashes ( A and B ), you can adjust the ratio between their light intensities as required.
This makes it possible to create a three-dimensional effect by applying various degrees of shading to the
subject as shown below.
Light ratio 8 : 1 1 : 1 1 : 8
When dial A is turned, the Twin Flash A / B light ratio is displayed on the control panel. The Twin
Flash light ratio is ready for adjustment.
• The control panel display shows both the light intensity ratio and bar graph simultaneously.
• The setting can be varied in steps of 1/3.
<MANUAL>
In this mode, the flash is emitted according to the light intensity setting.
1. The control panel shows the light intensity ratio.
When both of the two flashes are used, their combined
light intensity is displayed.
Light intensity ratio: Ratio of the current light intensity with
respect to the full flash light intensity.
* The light intensity ratio display can be changed to the guide number
(GN). display in the Custom Setup operation (page 98).
2. Tu rn dial A to set the desired light intensity ratio.
The available light intensity ratios are 1/1, 1/2, 1/4, 1/8,
1/16, 1/32, 1/64, 1/128, 1/256 and 1/512.
• The amount of illumination from the Twin Flash that is ap-
plied to the subject varies depending on such conditions
as whether one flash unit is used or two flash units are
used, angle adjustment and light ratio. Set the appropriate
iris (F) or light intensity ratio by referring to the guide num-
ber charts.
When using two flashes (Combined guide number)
MACRO FLASH CONTROLLER
FC-1
MODE
LAMP
AUTO
CHECK
TEST/
CHARGE
POWER
LIGHT
RATIO GN/
MACRO FLASH CONTROLLER
FC-1
MODE
LAMP
AUTO
CHECK
TEST/
CHARGE
POWER
LIGHT
RATIO GN/
Light inten-
sity ratio
1/1 1/2 1/4 1/8 1/16 1/32 1/64
1/128 1/256 1/512
GNm 22 16 11 8.0 5.6 4.0 2.8 2.0 1.4 1.0
GNft 72 52 36 26 18 13 9.2 6.6 4.6 3.3
When using only one flash
Light inten-
sity ratio
1/1 1/2 1/4 1/8 1/16 1/32 1/64
1/128 1/256 1/512
GNm 16 11 8.0 5.6 4.0 2.8 2.0 1.4 1.0 0.7
GNft 52 36 26 18 13 9.2 6.6 4.6 3.3 2.3
Light ratio
Control panel display
A
8 : 1
4 : 1
2 : 1
1 : 1
1 : 2
1 : 4
1 : 8
B
Only flash A fires.
Flash B does not fire.
Light ratio 8:1
(Equivalent to +3 steps when converted to
exposure value)
Light ratio 4:1
(Equivalent to +2 steps when converted to
exposure value)
Light ratio 2:1
(Equivalent to +1 steps when converted to
exposure value)
Both flash A and flash B emit light at the same
intensity.
Light ratio 1:2
(Equivalent to –1 steps when converted to
exposure value)
Light ratio 1:4
(Equivalent to –2 steps when converted to
exposure value)
Light ratio 1:8
(Equivalent to –3 steps when converted to
exposure value)
Only flash B fires.
Flash A does not fire.
Note
In situations where optimum
exposure cannot be obtained
with the selected light ratio
value, the system may auto-
matically change the value
before flash emission.
Twin Flash light ratio
Light intensity setting
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