Metz Mecablitz 45 CL-4 - Manual (Page 57)

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7. Bounce flash
Bounce flash illuminates the subject more softly and dense shadows are dimi-
nished. Moreover, the physically conditioned decline of light from the fore-
ground to the background is reduced.
The main reflector
ቢ of the flash unit can be swivelled horizontally and verti-
cally for bounce flash. To avoid colour cast bounce the flash off a colour-neu-
tral or white surface. The secondary reflector
ቧ can be additionally activa-
ted with the switch ቮ for fill-in frontal lighting.
Please note that bounce flash reduces the maximum flash range!
8. Illumination
The main reflector ቢ and the secondary reflector ቧ cover focal lengths as of
35mm. The wide-angle diffuser (45-42) (included with the flash unit) widens
the illumination of the main reflector for focal lengths as of 28mm (35 mm
format in all cases). The wide-angle diffuser diminishes the guide number,
and thus the maximum flash range, by approx. 30%. This is automatically
adapted by the aperture calculator on the flash head.
9. Fill-in flash
9.1 TTL fill-in flash
Most camera models automatically support the TTL fill-in flash control when
in Program or Auto Mode. Various camera models additionally feature spe-
cial TTL fill-in flash programmes that can be activated on the camera (see the
operating instructions for the given camera and SCA adapter).
9.2 Automatic fill-in flash
When in automatic fill-in flash mode the auto working aperture of the flash
unit is opened by approx. one stop increment further than the f-stop set on
the camera.
We suggest setting the camera in the aperture priority mode (e.g. A,
Av) or in manual mode M. When an adapter from the SCA 3002 sys-
tem is being used then manual aperture setting must be selected on the
flash unit if corrections cannot be entered on the camera!
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Example:
The aperture f/5.6 has been set on the camera. The aperture f/4 is manually
set on the flash unit for fill-in flash.
With an adapter from the SCA 3002 system and an appropriate camera a
correction value of approx. 1 f-stop is set on the camera for the flash during
automatic data transfer (ISO, aperture). An additional setting on the flash
unit is then not necessary!
10. Exposure corrections
Extreme contrast differences between subject and background can confuse
the automatic exposure system of the camera or flash unit. This can be com-
pensated by manual exposure correction.
Exposure correction in TTL flash mode must be set on the camera (see opera-
ting instructions for the given camera):
Dark subject against a bright background:
Positive correction value (approx. +1 to +2 f-stops).
Bright subject against a dark background:
Negative correction value (approx. -1 to -2 f-stops).
An f-stop which differs from the camera aperture is set manually on the flash
unit for Exposure correction in automatic flash mode.
Dark subject against a bright background: Set on the flash unit an f-stop that
is higher by one increment: e.g. camera aperture f/4; auto working aperture
on the flash unit f/5.6.
Bright subject against a dark background: Set on the flash unit an f-stop that
is lower by one increment: e.g. camera aperture f/4; auto working aperture
on the flash unit f/2.8.
When an adapter from the SCA 3002 system is used in conjunction
with a corresponding camera, the correction value for flash is set on
the camera during automatic data transfer (ISO, aperture). An additio-
nal setting on the flash unit is then unnecessary!
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704 47 0126.A5 45 CL-4 digi 01.02.2007 13:13 Uhr Seite 57