Autofocus Measuring Flash - Metz MECABLITZ 34 AF-3 N Mode D'emploi

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.
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
activated 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.

8. Autofocus measuring flash

Fig. 5: AF red-light beam
• The range of the autofocus measuring flash
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!
34
AF red-light beam
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 sen-
sor).