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Example:
Focal length of the lens = 35 mm;
position of flash reflector = 28 mm.
The picture is correctly illuminated because the
flash unit’s reflector covers an area larger than the
image size.
4.6 AF measuring beam control
The AF measuring beam is activated by the came-
ra’s electronic system when the ambient lighting
conditions are insufficient for automatic focusing.
The flash unit’s AF beam emitter projects a striped
pattern on to the subject and the camera uses this
pattern to focus automatically. The AF beam has a
distance range of about 6 m to 9 m. Parallax error
between the lens and the AF beam emitter limits
the close-up range to approx. 0.7 – 1 m. Zoom
lenses with a small initial aperture may signifi-
cantly reduce the distance range of the AF mea-
suring beam.
To enable activation of the AF measuring beam,
the camera must be switched to AF mode and the
central AF metering area must be activated (if a
camera with several AF sensors is used).
mecablitz 45 CL-4 and 60 CT-4
These flash units of the SCA 300 System are con-
nected to the SCA adapter by means of the „SCA
3000C“ cable (optional extra). The AF measuring
beam integrated in the SCA 3000C cable takes
over the AF measuring beam function of the flash
unit.
mecablitz 45 CL-4 digi
These flash units are connected to the SCA adap-
22