User Guide
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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 1/1600 second. Do not use leaf shutter speeds above 1/1600 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), off the lm (OTF) and electronic ash
exposure metering.
NOTE:
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 off-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.