Af Measuring Beam; Triggering Control - Metz MECABLITZ 54 AF-1M Manual De Instrucciones

The extended zoom mode is only possible in the „Auto Zoom" mode with a
focal length setting of 28 mm and longer. Since the start position of the zoom
reflector is 24 mm, a focal length of less than 28 mm will cause „24 mm" to
flash on the LC display, thereby warning the user that the required reflector
position for extended zoom mode cannot be set.
Shots with a 24 mm and longer focal length of the lens will be correct-
ly illuminated right out to the image corners also in extended zoom
mode!
Turning on the extended zoom mode
• Continue depressing the „Select" key combination (= „Mode" key +
„Zoom" key) until „Ex" appears on the LC display.
• Continue depressing the „Zoom" key until „ON" flashes on the LC display.
• The setting becomes instantly effective. The LC display is switched back to
its normal state after approx. 5 sec.
After the setting procedure, the „Ex" symbol for extended zoom mode will
continue to be indicated on the LC display of the flash unit!
Please note that the wider illumination coverage in extended zoom
mode results in a diminished maximum flash range!
Turning off the extended zoom mode
• Continue depressing the „Select" key combination (= „Mode" key +
„Zoom" key) until „Ex" appears on the LC display.
• Continue depressing the „Zoom" key until „OFF" flashes on the LC display.
• The setting becomes instantly effective. The LC display is switched back to
its normal state after approx. 5 sec.
After storage in the memory, the „Ex" symbol for extended zoom mode will
no longer be indicated on the LC display of the flash unit.

5.7 AF measuring beam

The AF measuring beam is activated by the camera electronics when the am-
bient lighting conditions are insufficient for automatic focusing. The AF beam
projects a striped pattern on to the subject, and the camera uses this pattern
to focus automatically. The AF beam has a range of approx. 6 m to 9 m
(with a 50 mm/f/1.7 standard lens). Parallax error between lens and AF red
light emitter limits the close-up range of the AF measuring beam to approx.
0.7 m - 1 m.
The camera lens must be switched to AF so that the AF measuring
beam can be activated by the camera. The AF mode „Single AF" or
„ONE-SHOT AF" must be set on the camera (see the camera's ope-
rating instructions). Zoom lenses with a lower initial aperture can
significantly reduce the range of the AF measuring beam!
The striped pattern of the AF measuring beam only supports the camera's
central AF sensor. We therefore recommend to activate only the central AF
metering area on cameras that feature several AF sensors (please refer to the
operating instructions of the given camera).
If a decentral AF sensor is manually selected by the photographer, or auto-
matically by the camera, then the emitter of the AF measuring beam on the
flash unit will not be activated. In such instances some cameras will use their
built-in AF illuminator (see camera manual).

5.8 Triggering control

The camera prevents the triggering of a flash if the ambient light level is suffi-
cient for an exposure in the normal mode. The exposure is then completed
with the shutter speed given in the display or viewfinder of the camera. The
triggering control is activated when the flash-ready signal in the camera's
viewfinder is extinguished. In this event no flash is fired when the camera's
shutter is tripped.
On various cameras the triggering control only works in the Program "P"
Mode and in the Shutter Priority Mode "S" (see operating instructions for the
camera). The triggering control can be deactivated on some camera models:
To do so, press and hold down the flash button
shooting (see camera manual). The flash-ready signal will again be dis-
played in the camera's viewfinder when the shutter release is lightly touched.
The camera selects a suitable shutter speed/aperture combination and a
flash is fired when a picture is shot.
on the camera during
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