79XF Camera System Manual |
Focal Plane and Leaf Shutter Lenses
The Phase One XF oers a dual shutter option for the utmost in exposure
versatility with flash and ambient light.
Phase One FPS (Focal Plane Shutter) lenses
The XF Camera Body has a built in focal plane shutter (FPS) for use with
Phase One lenses and oers a range of Shutter Speeds from 1/4000th
second to 1 hour (determined by the IQ Digital Back model used), however
flash sync is limited to a maximum of 1/125th of a second Shutter Speed.
Schneider Kreuznach LS (Leaf Shutter) lenses
Schneider Kreuznach lenses have a built-in leaf shutter (LS). When used in
combination with the Phase One XF Camera Body and IQ Digital Back, the leaf
shutters have the capability to synchronize with flash systems up to an
unprecedented 1/1600th of a second Shutter Speed.
If using LS lenses, the XF Camera Body will indicate if LS or FPS is active on
the top screen. The shutter preference can be set using the camera menu from
the top screen, or from the XF menu on the IQ Digital Back. Select Capture
Setup > Shutter > LS Priority / FPS Only.
Please note that if you are using the QI3 100MP digital back, you will also have
the option to use the Electronic Shutter (ES) by choosing ‘ES Only’. In that
case, the XF Camera Body will display ES on the top screen.
Advantages of FPS (Focal Plane Shutter)
One notable advantage of FPS is ability to shoot up to 1/4000th of a second.
This overcomes the use of ND filters that results in reduced viewfinder brightness
and AF performance. Another benefit is the shutter response time, which is
almost twice as fast as a leaf shutter. This means that if you are photographing
within the FPS flash sync speed range (using flash or not), there is a shorter
time lag between pressing the shutter button and the focal plane shutter
being released.
Advantages of LS (Leaf Shutter)
If you want to synchronize flash at a Shutter Speed faster than 1/125th of a
second, for example to freeze motion or to work with wider Apertures for
selective focus techniques when using balanced fill flash, the Schneider
Kreuznach LS lens option overcomes the slow flash sync limitations of focal
plane shutters. Another advantage is less vibration during capture due to the
lower inertia of the lighter weight shutter blades. The issue of vibration,
however, is addressed even on non-LS lenses with the Low Vibration mode of
the XF Camera Body.
XF Camera System Lenses
Shutter preference
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