Pentax 300X - Manual (Page 9)

• Switch on the Main Switch.
As soon as the Flash Ready
Lamp turns on, press in the
Test Button to make sure the
Auto Check Lamp turns on. If
it turns on, you are ready to
take automatic flash pictures.
The flash will automatically
provide the right amount of
light for correct exposure.
• If the Auto/Manual Switch is
set to M, your Auto Strobo
300X will work as a manual-
operation flash having a guide
number of 30 (ISO/ASA100 m).
To find the correct aperture,
divide the guide number by
the flash-subject distance, and
set the aperture ring accord-
ingly. The guide numbers rela-
tive to the film ISO/ASA speeds
are shown in the followng
table.
m
ft
ISO/
ASA25
15DIN
15
50
ISO/
ASA50
18DIN
21
71
ISO/
ASA100
21 DIN
30
100
ISO/
ASA200
24DIN
42
140
ISO/
ASA400
27 DIN
60
200
Note: If you are using bounced
lighting on the manual mode, care
must be taken because the guide
number will become smaller.
TAKING FLASH
PICTURES(II)
(Bounce-light pictures)
If your subject is standing near a
wall, you will get distracting
shadows in your picture if you
flash it from the front. In this
case, rotate the flash head upward
so that it is indirectly illuminated
by the light reflected from the
ceiling. The lighting will thus be
soft and shadows can be practical-
ly controlled. This is called
"bounce flash."
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