10.4 Contrast control (C
To facilitate subject and pictorial composi-
tion, the camera flash can be combined with
an external flash unit (mecablitz) to perform
so-called contrast control when in P-TTL flash
mode. Here the camera flash provides 1/3 of
the required flash power and the external
flash unit provides the remaining 2/3.
Please observe the maximum possible flash
range (guide number) of both flash units to
ensure the correct operation of the contrast
control!
The benefits of contrast control can, however,
only be optimally exploited if the external
flash unit is set up at a reasonable distance
from the built-in camera flash.
To do so, the following original Pentax acces-
sories are available:
k
The "sync cable F 5P", combined with the
"adapter foot F" (to hold the external flash
unit) and "adapter foot FG" (for the connec-
tion to the camera). In this context, please
read the notes in the camera's operating
instructions.
The auto-focus measuring beam in the meca-
blitz cannot be used in the contrast control
mode.
168
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ONTR
TRL
+
Contrast control cannot be activated if the
high-speed synchronisation FP or HSS is set
at the flash unit (see 6.4)!
The contrast function is not activated if the
camera flash has not been engaged or the P-
TTL flash mode has not been selected on the
flash unit. Synchronisation is with the 1st
shutter curtain.
The contrast function is automatically can-
celled as soon as REAR mode (see 10.5) or
the High-Speed flash mode P-TTL-HSS (see
6.4) are activated.
Most integrated camera flash units only light
focal lengths up to 35mm (see the camera's
operating instructions). If working with a
focal length shorter than 35mm, a flash sym-
bol appears in the LC display of the camera or
in the camera viewfinder to warn you that the
marginal illumination of the subject may not
be sufficient! For more details see your came-
ra's operating instructions.