Metz 28 AF-4 C operating instructions Autofocus measuring flash, Ring flash

8. Autofocus measuring flash

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 k f/5.6 or f/8 (such as zoom lenses), significantly restrict the range of the autofocus measu-

ring flash!

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