Cheetah cl-360x, Instruction Manual

Page: 9 / 17

1/4 1 / 2 1/1
1/1–0.3
1/2+0.7
1/1-0.7
1/2+0.3
1/2-0.3
1/4+0.7
1/2-0.7
1/4+0.3
······
······
- 13 - - 14 -
Press < S1/S2 > button so that this flash can also function as an optic S2 secondary flash with optic sensor in M
manual flash mode. This is useful when cameras have pre-flash function. With this function, the flash will ignore a
single "preflash" from the main flash and will only fire in response to the second, actual flash from the main unit.
Optic S1 Secondary Unit Setting
In M manual flash mode, press < S1/S2 > button so that this flash can function as an optic S1 secondary flash with
optic sensor. With this function, the flash will fire synchronously when the main flash fires, the same effect as that by
the use of radio triggers. This helps create multiple lighting effects.
Optic S2 Secondary Unit Setting
● S1 and S2 optic triggering is only available in M manual flash mode.
Display Flash Duration
Flash duration refers to the length of time that from flash’s firing to reach the half peak at maximum. The half peak
at maximum is usually expressed as t=0.5. In order to provide the photographer with more concrete data, this
product adopts t=0.1. The difference between t=0.5 and t=0.1 is shown in the following picture.
A
t
50 %
10 %
t = 0 . 5
t = 0 . 1
In M/Multi mode which without high-speed sync,
flash duration is displayed on the LCD panel.
The flash output is adjustable from 1/1 full power to 1/128th power in 1/3rd stop increments. To obtain a correct
flash exposure, use a hand-held flash meter to determine the required flash output.
Press < MODE > button so that
1
< M > is displayed.
Turn the Select Dial to choose
2
a desired flash output amount.
Flash Output Range
The following table makes it easier to see how the stop changes in terms of f/stop when you increase or decrease
the flash output. For example, when you decrease the flash output to 1/2, 1/2-0.3, or 1/2-0.7, and then increase the
flash output to more than 1/2, 1/2+0.3, 1/2+0.7, and 1/1 will be displayed.
Figures displayed when reducing flash output level
→
← Figures displayed when increasing flash output level
Press < SET > button again to
3
confirm the setting.
Flash Mode — M: Manual Flash
With stroboscopic flash, a rapid series of flashes is fired. It can be used to capture a multiple images of a moving
subject in a single photograph.
You can set the firing frequency (number of flashes per sec. expressed as Hz), the number of flashes, and the flash
output.
Press < MODE > button so that
1
< MULTI > is displayed.
Calculating the Shutter Speed
During stroboscopic flash, the shutter remains open until the firing stops. Use the formula below to calculate the
shutter speed and set it with the camera.
Number of Flashes / Flash Frequency = Shutter Speed
For example, if the number of flashes is 10 and the firing frequency is 5 Hz, the shutter speed should be at least 2
seconds.
To avoid overheating and deteriorating the flash head, do not use stroboscopic flash more than 10 times in succession. After
10 times, allow the camera flash to rest for at least 15 minutes. If you try to use the stroboscopic flash more than 10 times in
succession, the firing might stop automatically to protect the flash head. If this happens, allow at least 15 minutes' rest for the
camera flash.
● Stroboscopic flash is most effective with a highly reflective subject against a dark background.
● Using a tripod and a remote control is recommended.
● A flash output of 1/1 and 1/2 cannot be set for stroboscopic flash.
● Stroboscopic flash can be used with“ buLb ”.
● If the number of flashes is displayed as “--”, the firing will continue until the shutter closes or the battery is exhausted. The
number of flashes will be limited as shown by the following table.
Maximum Stroboscopic Flashes:
1/4
1/8
1/16
1/32
1/64
1/128
1
7
14
30
60
90
100
2
6
14
30
60
90
100
3
5
12
30
60
90
100
4
4
10
20
50
80
100
5
4
8
20
50
80
100
6-7
3
6
20
40
70
90
8-9
3
5
10
30
60
80
Flash
Output
Hz
10
2
4
8
20
50
70
11
2
4
8
20
40
70
12-14
2
4
8
20
40
60
15-19
2
4
8
18
35
50
20-50
2
4
8
16
30
40
60-199
2
4
8
12
20
40
If the number of flashes is displayed as "--", the maximum number
of flashes will be as shown in the following table regardless of the
flash frequency.
Hz
Set the flash frequency and flash times.
2
● Press Function Button 3 < > button to select the flash times.
Turn the Select Dial to set the number.
● Press Function Button 4 < > button to select the flash times.
Turn the Select Dial to set the number.
● After you finish the setting, press < SET > button and all the settings will
be displayed.
MULTI
Flash Mode — Multi: Stroboscopic Flash
Flash Output
Number of Flashes
1/4
2
1/8
4
1/16
8
1/32
12
1/64
20
1/128
40