PhaseOne P 20, Reference Manual

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P - Series Reference Manual
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16. Lens Cast
What is Lens Cast?
Lens cast may occur if using the camera back
with wide- angle lenses e.g. Horseman Digiflex II,
Hasselblad Flexbody or Hasselblad 905SWC or on
other large format cameras with different tilt or swing
settings. On a medium format camera lens cast is very
rare if using fixed lenses from 60 mm to 120 mm.
Why does it occur?
Lens cast occurs as a result of the angle at which the
CCD is exposed to light. If the CCD is exposed to light
coming from a very sharp angle e.g. wide-angle or ex-
treme degrees of tilting you may experience lens cast.
What does it look like?
Depending on the light conditions and photographic
setup, lens cast will typically appear as a green cast in
one corner of the image that changes into a magenta
cast in the opposite corner of the image. It’s often vis-
ible on neutral grey backgrounds.
How do i get rid of it?
If working with large format cameras with tilt and
swing, you would have to make a new calibration file
if you change the tilt and swing position. Phase One
provides a solution in the Capture one software that
helps you get rid of the lens cast. We call it: Lens Cast