Metz 34 AF-3N operating instructions Autofocus measuring flash, AF red-light beam

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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 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.

AF red-light beam

Fig. 5: AF red-light beam

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 sen- sor).

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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Contents Mecablitz 34 AF-3 N Disposal of batteries ForewordDear Customer Do not dispose of spent batteries with domestic rubbishContents Safety instructions Do not short-circuit batteries! Danger of ExplosionLoading and exchanging batteries Power supplyPreparing the mecablitz for use Automatic flashgun switch-off Mounting/Removing the flashgunSwitching the flashgun on and off Setting the mecablitz into operationFeatures this function Automatic flash sync speed control Flashgun instructions to the cameraFlash-ready indication Correct-exposure indication see figRed arrow Switched onTo the camera’s operating instructions CationTTL flash control Slow-synchronisation Flash synchronisationNormal synchronisation Second curtain synchronisation Rear Special functions not supported by flash Flash in the individual camera modesUse of flash in the program modes Red-eye reduction function Multi-sensor fill-in flashAutofocus measuring flash AF red-light beamFocusing priority Single AF AF operating modesExposure correction Flash techniques and flash functionsAutomatic fill-in flash Flash exposure sequencesLighting and attachments Guiding edge Case gapForming the flash capacitor Care and maintenance TroubleshootingSwitch off the flashgun with the main switch Manual firing buttonFlash duration Technical dataColour temperature approx K Synchronization Number of flashes Flash recycling timeLighting distances Sticker can be applied to the back of the flashgun