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3.10 Flash Photography
The Phase One 645DF is equipped with a horizontal focal-plane metal shutter
and it is also compatible with leaf shutter lenses.
The focal-plane shutter provides higher shutter speeds than that of leaf
(central) shutter lenses. Focal-plane shutters allow you to shoot fast enough
to freeze moving subject matter. Leaf shutter lenses will allow faster shutter
synchronization to ash, making it ideal to freeze subject movement when
using strobe lighting.
The focal-plane shutter method allows for shutter speeds of up to 1/4000
sec. When shooting at higher speeds e.g. 1/500 sec. the two shutter blades
are moving in parallel creating a small slit allowing a small fraction of light to
reach the sensor area of the digital back. When using this type of shutter it is
not possible to achieve ash synchronization greater than 1/125 sec.
A leaf shutter will make it possible to achieve faster shutter and ash sync
speeds. An IQ Series back can achieve a maximum shutter speed of 1/800
second. Do not use leaf shutter speeds above 1/800 sec.
1. A grip type ashgun or a strobe (with electric contacts other than X
contact) can be operated with the Phase One 645DF by connecting a sync
cord into the camera’s sync terminal. (See the note in the bottom left corner
of the page about ash units designed exclusively for other camera makes.)
2. Turn the exposure mode setting dial to “X” (1/125 sec.) or M (manual).
When M (manual) is selected, turn the front dial and set the shutter speed to
1/125 sec. or slower.
3. Turn the rear dial to set the aperture, and then press the shutter button to
take a picture.
In addition to its standard ash sync system, the Phase One 645DF features
TTL (through the lens), o the lm (OTF) and electronic ash exposure
metering.
NOTICE:
This camera’s synchro contact is an X
contact.
Using ashes designed exclusively for other
camera manufacturers in the hot shoe may
damage the camera’s internal mechanisms.
In this situation, use an o-camera ash
bracket and connect a sync cord to the
camera’s synchro terminal.
When using ashes with a ash duration of
1/500 sec. or longer, set the shutter speed
to 1/30 sec. or less.
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