Metz MECABLITZ 28 AF-4 Minolta - Manual (Page 32)

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.
• 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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