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5.6 AF measuring beam
The AF measuring beam is activated by the camera electro-
nics when the ambient lighting conditions are insufficient for
automatic focusing. The AF beam emitter then projects a
striped pattern on to the subject, and the camera uses this
pattern to focus automatically.
To enable activation of the AF measuring beam by the
camera, the camera lens must be set to AF. On the
camera, the AF mode “Single-AF” or “ONE-SHOT-AF”
must be selected. Low-speed zoom lenses may significant-
ly reduce the distance range of the AF measuring beam.
The striped pattern of the AF measuring beam only supports
the camera’s central AF sensor. When using cameras with
several AF metering areas we therefore recommend to acti-
vate the camera’s central AF metering zone.
Some cameras may only activate the AF illuminator inte-
grated in the camera. In such an event, the AF measuring
beam emitter of the mecablitz will not be activated.
☞
Please refer to the corresponding information given in
operating instructions for the individual camera.
5.7 TTL flash mode
The mecablitz is only suitable for the TTL flash mode.
The TTL flash mode is a very simple way to achieve excellent
flash shots. In this mode exposure readings are taken by a
sensor built into the camera which measures the light reach-
ing the film through the camera lens (TTL). The electronic
control circuit within the camera transmits a stop signal to the
mecablitz as soon as the film has been exposed by the cor-
rect amount of light, thereby instantly interrupting the flash.
The advantage of this flash mode is that all factors in-
fluencing correct exposure of the film (filters, change of aper-
ture and focal length with zoom lenses, extensions for close-
ups, etc.) are automatically taken into account. You need not
worry about setting the flash, the camera’s electronic system
automatically determines the correct amount of flash light
required.
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