Pentax 300X - Manual (Page 11)

USING THE WIDEANGLE ADAPTER
If you are taking flash pictures
with a 28mm lens, attach the
Wideangle Adapter (included) to
the front of the flash lamp-face.
The illumination angle will thus
cover the view angle of a 28 mm
lens (53° vertical, 70° horizontal).
Since the use of the wideangle
adapter results in a loss of light,
refer to the following instructions
to set the exposure.
• Automatic flash range
If the Wideangle Adapter is used,
the automatic flash range changes
as follows:
Red mark . . . . 1.5 - 7.6m
( 5 ~ 2 5 f t . )
Green mark . . . 1 - 3.8m
(3.3 ~ 12.5 ft.)
Yellow mark . . 0.7 - 2 m
(2.3 ~ 6.6 ft.)
• Manual flash exposure
In this case, the aperture should
be opend by one step from that
obtained by dividing the guide
number by the flash-subject
distance.
Example: If the shooting dis-
tance is 5 m, the aperture to use is
f/5.6 without wideangle adapter
because 30 5 = 6. With it at-
tached, however, open the aper-
ture by one step and use f/4.
OFF-CAMERA
FLASH OPERATION
It is possible to use Auto Strobo
300X away from the camera by
means of the PC synchro cord
supplied. When employed in this
way, always ensure that the total
flash-to-subject distance is taken
into account, or under-exposure
will result.
Also ensure that the flash unit is
held "square" to the camera, i.e.
do not allow the flash to face
away from a reflecting surface.
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