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8. Autofocus measuring flash
37
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 pat-
tern
of red vertical stripes onto the subject as soon as
the camera’s release
is lightly touched. 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
prevailing light is insufficient for the exposure.
• The autofocus measuring flash cannot be activa-
ted in every exposure mode or AF mode of the
camera. In most cases, it will only support the
SINGLE-AF function (see camera’s operating
instructions) without follow-up focusing.
• The range of the autofocus measuring flash
depends on the speed of the lens (maximum aper-
ture)! With an f/1.8 standard lens of 50 mm
focal
length, the range is approx. 6-10 m (depending 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
measuring flash!
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