Sigma EM-140DG Mode D'emploi page 21

It is possible to give the three dimensional effect to your pictures by firing only one side of the
flash.
1. In the TTL/BL(TTL) mode, press the SEL button to make the Flash
Unit display blink.
2. By pressing the + button, the left flashtube will fire, and by pressing
the - button, the right flashtube will fire. (Only the firing side will
blink on the flash unit display)
3. Press the SEL button several times to stop the blinking.
 After shooting please press SEL button and then the + or -
button. By doing this flash unit will be set to default mode, display will
show both sides.
LIMITS OF CONTINUOUS SHOOTING
To prevent overheating of the flash's circuitry, please do not use your Flash unit for at least 10minutes after
using the number of flash exposures, shown in the below table have been made in quick succession.
TTL, M(1/1,1/2)
M(1/4, 1/8)
M(1/16-1/32)
MANUAL FLASH OPERATION
Manual flash provides adjustment of desired flash intensity (flash output level).
 The shooting in Manual Mode requires a very advanced technique. We
recommend you use the Auto mode. When using Manual Flash
photography, first take some test shots. It will be beneficial to use a
flash meter device for determining the exposure.
 Flash intensity of left and right tubes can be set between 1/1~1/64. It is
also possible to set without firing one of them.
1. Set the camera's exposure mode to M.
2. Press the MODE button on the flash unit to select M.
3. Press the SEL button. (The flash intensity display of the left flashtube
blinks).
4. Press the + or
(If " -- " is displayed, the left flashtube will not fire).
5. Press the SEL button. (The flash intensity display of right flashtube will blink).
6. Press the + or
(If " -- " is displayed, the right flashtube will not fire).
7. Press the SEL button to stop the indicator blinking.
 If the flash output level values of both tubes are the same, the flash
output level will be displayed. When the different flash intensity is set,
the flash output level will not be displayed on the LCD.
 Regarding Guide Number, please refer to the [Table.1] on the last page.
 You can calculate the correct exposure by using the following formula:
Guide Number "GN" / Flash to Subject Distance = F-stop
FV LOCK (D70,F6 only)
"FV" lock mode allows you to choose exposure for the part of the viewfinder, and lock it in, before taking
the picture.
You cannot set this function on the flashgun directly. For details please refer to your camera's instruction
manual.
Mode
Multi
- button to set the left flashtube output level.
- button to set the right flashtube output level.
Number of Flash Exposures
15 Continuous Flash Shots
20 Continuous Flash Shots
40 Continuous Flash Shots
10 Cycle
20