8. Autofocus measuring flash
32
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 touched (or is
activated by the eye-start system of cameras of the
xi series). The camera’s autofocus system then focu-
ses 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.
• Depending on the prevailing ambient light, either
the AF illuminator of the camera or that of the
flashgun will be activated whenever the autofocus
measuring facility becomes necessary.
•T
he 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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