39
3.10 Flash Photography
The Mamiya 645DF+ is equipped with a vertical-travel 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 allow faster
shutter synchronization to flash, making it ideal for freezing 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 flash synchronization greater than
1/125 sec.
A leaf shutter makes it possible to achieve faster shutter and flash sync
speeds. A Leaf Credo series back can sync at maximum shutter speed
of 1/1600 second.
1. A grip type flashgun or a strobe (with electric contacts other than X
contact) can be operated with the Mamiya 645DF+ by connecting
a sync cord into the camera’s sync terminal. See the note on the
left side of this page about flash 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 flash sync system, the Mamiya 645DF+
features TTL (through the lens), off the film/sensor (OTF) and electronic
flash exposure metering.
Notice:
This camera’s sync contact is
an X contact.
Using flashes designed
exclusively for other camera
manufacturers in the hot shoe
may damage the camera’s
internal mechanisms. In this
situation, use an off-camera
flash bracket and connect a
sync cord to the camera’s sync
terminal.
When using flashes with a flash
duration of 1/500 sec or longer,
set the shutter speed to 1/30
sec or less.
A
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