Sigma EF-500 DG ST PA-PTTL Instrucciones página 8

U S I N G F L A S H I N O T H E R C A M E R A M O D E S
Shutter Speed Priority Setting
By selecting the Tv mode of the camera, you can set the shutter speed from 30sec. to 1/X sync
speed. When you set the desired shutter speed, the camera will select the appropriate aperture
value for the background. lf the subject is too light or too dark, the aperture value indicator will blink
and show the limit values (maximum or minimum aperture). In such as case, the camera proceeds
to take flash photograph at the limit value. Thus, the main subject in the picture may be exposed
correctly, but the background will become under or over exposed.
Aperture P riority Setting
By selecting the Av mode of your camera, the camera will select the appropriate shutter speed for
the background. lf the subject is too bright or too dark, the shutter speed indicator will blink and
show the limit highest or slowest shutter speed value. The highest shutter speed will be limited to
the camera's normal flash synchronization speed. In such a case, the camera proceeds to take a
flash photograph at the limit value. Thus, the main subject in a picture may be exposed correctly,
but the background will become under or overexposed.
When used with M Mode
You can set the desired shutter speed and apertura value. The sync speed of camera is 30sec. lf
you adjust exposure according to the exposure meter indication, the camera will work as for
Daylight synchronization flash or slow synchronization.
MANUEL FLAS.H OPERATION
This flash unit can be used in Manual Mode at full power and at 1/16 power.
1 . S e t t h e c a m e r a ' s e x p o s u r e m o d e t o M a n u a l / M m o d e .
2.Slide the flash unit's Power Switch to MH (full flash power) or to ML (1/16 flash power).
3.Focus on the subject and set the camera's F-stop, using the exposure calculated by the formula
shown below:
F-stop = Guide Number (G.N.) ;
Flash to Subject Distance (m)
4.After the flash is fully charged, press he Shutter Release button to take the picture.
Guide Number will change according to the Zoom Head position, (see (chart.2) ). Guide Number
will also change according to film speed (lSO),(see (chart.3) ). In the case of non-lSO100 speed
films, multiply the (chart.3)) number by the ((chart.2) number. For example, using lS0400 film, Zoom
Head position for 50mm and the MH mode; multiply the (chart.3) number "2" by the ((chart.2)
number "40": 40X2=80. This will be the new effective Guide Number (G.N.) in meters. To
determine the G.N. in feet, multiply the G.N. in meters by 3.3.
EX. lf flash to subject distance is 10 meters:
F - s t o p = 8 0 - . 1 0 = 8 ( I i s t h e F - s t o p t o s e t o n t h e c a m e r a . )
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When repeatedly using the flash rapidly in the MH mode, it should be allowetllo
'rest"
foi about 15
m i n u t e s a f t e r e a c h 1 5 f l a s h e s . l f u s e d u n d e r t h e s a m e c o n d i t i o n s i n t h e M L m o d e , t h e f l a s h s h o u l d
be allowed to "rest'afier each 40 flashes.