40
41
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.
<Using the diffuser FDT-1>
The diffuser enables shooting under soft lighting by attenuating the shades on the subject.
Another way that shooting options are increased is the ability to use the wide-open iris (F).
1.
Insert the diffuser into the diffuser mounting grooves of
the Twin Flash.
• Since the use of the diffuser reduces light intensity by about
2 steps, the guide numbers (GN) change as shown in the
following tables.
TTL AUTO
• Flash at optimum exposure is possible, but the light con-
trol range is reduced due to decrease in the guide num-
ber (GN).
MANUAL
• Refer to the following tables when setting the lens iris (F).
When using two flashes (Combined guide number)
Light intensity ratio
1/1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
1/256
1/512
GNm
Without diffuser
22
16
11
8.0
5.6
4.0
2.8
2.0
1.4
1.0
With diffuser
11
8.0
5.6
4.0
2.8
2.0
1.4
1.0
0.7
0.5
GNft
Without diffuser
72
52
36
26
18
13
9.2
6.6
4.6
3.3
With diffuser
36
26
18
13
9.2
6.6
4.6
3.3
2.3
1.7
When using only one flash
MACRO FLASH CONTROLLER
FC-1
MODE
LAMP
AUTO
CHECK
TEST/
CHARGE
POWER
LIGHT
RATIO
GN/
<Other operations>
■
The tripod screw of the Twin Flash can be used as follows.
• TTL AUTO
Flash at optimum exposure is available but the light con-
trol range varies depending on the shooting conditions.
• MANUAL
Set the lens iris (F) by performing test flash activation.
Light intensity ratio
1/1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
1/256
1/512
GNm
Without diffuser
16
11
8.0
5.6
4.0
2.8
2.0
1.4
1.0
0.7
With diffuser
8.0
5.6
4.0
2.8
2.0
1.4
1.0
0.7
0.5
0.4
GNft
Without diffuser
52
36
26
18
13
9.2
6.6
4.6
3.3
2.3
With diffuser
26
18
13
9.2
6.6
4.6
3.3
2.3
1.7
1.2
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
If the selected Twin Flash light
ratio is too low for the selected
light intensity ratio (guide
number), the Twin Flash light
ratio display blinks. If this hap-
pens, change the Twin Flash
ratio or light intensity ratio
(guide number) (page 46).
Twin Flash light ratio
Summary of Contents for MACRO FLASH SYSTEM
Page 53: ......
