PhaseOne P 65+ - 16 Lens Cast Calibration; What Is Lens Cast; How Do I Get Rid of It

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16.0 Lens Cast calibration
16.1 What is Lens Cast?
Lens cast may occur if using the P 65+ with wide-angle lenses or on
Technical cameras with the possibility to tilt or shift the lens in front of
the CCD.
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 extreme degrees of tilting or shifting 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 side of the image that changes
into a magenta cast in the opposite side of the image. This is mostly
visible on neutral grey backgrounds.
16.2 How do I get rid of it?
If working with Technical cameras with tilt and shift, you would have to
make a new calibration le if you change the tilt or shift position.
Phase One provides a solution in the Capture One 4 PRO that helps
you get rid of the lens cast. We call it: Lens Cast Calibration (LCC).
By holding an opal white plate in front of the lens and capturing a
calibration image that you then apply to all of your capture les you are
able to remove the lens cast.
On medium format cameras with xed lenses the calibration is very
simple: You do one calibration for each lens and then save the calibration
les and apply them when needed by clicking “Set as default for new
Captures”.