Metz 28 AF-4 C - Manual (Page 31)

8. Autofocus measuring flash
31
The integrated AF red-light beam of the mecablitz
supports the automatic focusing of autofocus TTL
cameras. When the prevailing light is insufficient for
automatic focusing, the mecablitz will project a
pattern of red vertical stripes onto the subject as
soon as the camera’s release is lightly. The camera’s
autofocus system then focuses the picture by this
striped pattern.
Notes:
• When the camera’s autofocus system is on, the
electronic circuit will automatically activate the
autofocus measuring flash whenever the prevai-
ling light is insufficient for the exposure.
• The autofocus measuring flash cannot be
activated in every operating or autofocusing mode
of the camera. It only supports focusing priority
(one-shot AF: see camera’s operating instruc-
tions). Use of the autofocus measuring flash is not
possible with shutter release priority (Al Servo AF)
• Depending on the camera type, either the AF
illuminator of the camera or that of the flashgun
will be activated whenever the autofocus measu-
ring facility becomes necessary.
• The range of the autofocus measuring flash
depends on the speed of the lens (maximum
aperture)! With an f/1.8 standard lens of 50 mm
focal length, the range is approx. 6-10 m (depen-
ding on the sensitivity of the camera’s AF sensor).
Low-speed lenses, e.g. with an aperture of
f/5.6 or f/8 (such as zoom lenses), significantly
restrict the range of the autofocus measu-
ring flash!
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