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Fig. 23 / Grabado 23
Fig. 24 / Grabado 24
Ex
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44 AF-3C
5.7 AF measuring beam (Fig. 24 )
The AF measuring beam is activated by the came-
ra electronics when the ambient lighting conditi-
ons are insufficient for automatic focusing. The AF
beam projects a striped pattern on to the subject,
and the camera uses this pattern to focus automa-
tically. The AF beam has a range of approx. 6m
to 9m (with a 50 mm/f/1.7 standard lens). Paral-
lax error between lens and AF red light emitter
limits the close-up range of the AF measuring
beam to approx. 0.7m - 1 m.
The camera lens must be switched to AF so
that the AF measuring beam can be acti-
vated by the camera. The AF mode „Single
AF" or „ONE-SHOT AF" must be set on the
camera (see the camera's operating instruc-
tions). Zoom lenses with a lower initial
aperture can significantly reduce the range
of the AF measuring beam!
The striped pattern of the AF measuring beam
only supports the camera's central AF sensor.
Consequently, for the cameras EOS 1N, 1V, 3,
300, 50, 50E, 500N, IX and IX7, only the came-
ra's middle AF metering area should be activated
(see the camera's operating instructions).
If a decentral AF sensor is manually selected by
the photographer, or automatically by the came-
ra, then the emitter of the AF measuring beam of
the mecablitz will not be activated. In such
instances some cameras will use the AF illumina-
tor integrated in the camera (see the camera's
operating instructions). On some EOS cameras
only the AF illuminator integrated in the camera is
activated when the need arises. These include
EOS 500, 5, 10, 10S, 5000, REBEL X, REBEL XS,
A2, A2E, 888 (see Table 1). In such instances the
AF red-light emitter in the mecablitz will not be
activated. Please refer to the corresponding
details in the camera's operating instructions.
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