Phase One 645 AF - Manual (Page 41)

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Example:
(1) When the size of the subject you want to light with the flash is
relatively small within the picture
(2) When the background behind the subject is extremely bright or when
there is a strongly reflective object in the background
(3) When the background behind the subject is extremely dark (outdoors
at night, etc.)
(4) For flash photography with a narrow film latitude
1. While in the P or Av modes, the camera can be set to release the
shutter at the metered value, even the background behind the subject
is dark. Custom settings C-24.
2. The sync. speed in the X mode can be set between 1/40 and 1/125
seconds. Custom settings C-23.
* When the shutter speed is set to 1/2 increments, the sync. speed can
be set between 1/45 and 1/125 seconds.
Rear Curtain Syncro
When a moving subject has been shot under this function, the flash of
light appears after the moving subject.
Rear curtain sync mode
Front curtain sync mode
This function is set by Custom function setting.
Custom setting C-27.
Exposure mode Shutter speed Aperture
P Program AE Automatically set by
camera to 1/60 sec.
when the metered
shutter speed is 1/60
or slower, and 1/125
when it is 1/125 sec.
or faster. Automatically set by
camera
Av Aperture priority AE Any aperture
Tv Shutter priority AE Automatically set
by camera to 1/125
when the set shutter
speed is 1/125 sec.
or faster. Automatically set by
camera
M Manual mode Any aperture
X Synchro mode 1/125 sec. Any aperture
NOTICE:
With TTL flash photography, the
reflection of the flash is metered
and the intensity of the flash is
adjusted automatically, so TTL flash
photography may not be able to
suit to all conditions. In the cases
described below, we recommend
that you use a flashmeter to check
the intensity of the flash or to use a
manual flash setting.