Ricoh Pentax 645Z, Operating Manual

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Do not use high-voltage or high-current external flashes. They may
cause the camera to malfunction.
A flash with reversed polarity (the center of the hot shoe or sync
plug has a negative symbol) cannot be used, as this may damage
the camera or flash.
Linked functions do not work.
To prevent vignetting caused by Trailing Curtain Sync from
occurring, it is recommended to take a test shot using a shutter
speed one stop slower than the flash sync speed.
You can connect a sync cord
to the sync socket on the camera.
The flash connected to the sync socket can be discharged in
Modeling Flash or Test Flash mode by pressing 8 . The setting can
be changed with [Illumination Button] in [Button Customization]
of the
A
4 menu. (
w
p.R20)
The contact of the sync socket is not dust-proof or water-resistant.
Attach the provided Sync socket 2P cap when not in use.
Sync socket
Sync socket 2P cap