Mamiya 645 PRO TL - Manual (Page 34)

TTL Flash Photography with Metz Flash Units
1. Attach a Metz flash unit which
features TTL function to the camera.
Attach the SCA396 module to the
camera’s flash shoe. Connect the
module’s coiled cables to the camera
and the flash unit.
Set the film speed dial on the SCA396
module to the IS0 rating for the film
in use. The range of IS0 is 25 to
1250.
2. Move the flash unit’s power switch
to ON and the mode selector to TTL.
3. Turn the camera’s shutter release
selector switch to ON. When the
charge cycle is completed you will
see an illuminated green readylight
in the middle of the right side of the
finder. When the SCA396 module is
connected, the camera’s focal plane
shutter will automatically set at 1/60
sec, and ignore the settings on the
shutter speed dial between 1/60 to
1/1000, including A and AEL. Slower
shutter speed settings, however,
(1/30 to 4 sec.) are not affected and
will allow flash synchronization.
4. Set lens to the desired f/stop and
shoot. After the exposure is made,
the illuminated green blinks,
confirming proper flash exposure. If
the illuminated green does not blink
after exposure, it is possible that
aperture selected is not within the
exposure/distance range of the flash.
In this case, select a wider aperture
setting. When using flash at
maximum distance, which requires
unit,
time will be longer. Wait for the
readylight to go on before firing the
next frame. Exposure Compensation
with TTL Flash Automation.
Because TTL Flash automation reads
the light reflecting off the subject,
exposure may require manual
in cases where subject
and background are predominantly
white or black (e.g. bride in white
dress against white background;
bridegroom in tuxedo against dark
background.) In these instances, the
resulting exposure will either be
under-exposed or over-exposed. For
such situations, adjustment of about
1 to 1 f/stops, plus minus, may
be
Alternatively, a hand held incident
flash meter reading will show proper
exposure in these cases.