Lens Calibration Guide
3
Lens Calibration Guide
Introduction
Shooting images with wide angle lenses and exploiting large format camera
movements often results in lens fall-off and color cast effects. Another effect is
the so-called centerfold effect where lines may appear in the image.
Lens Calibration corrects all three of these effects.
The following shots show the same image with and without lens calibration:
What is lens cast and how is it recognized?
Why is Lens falloff associated with lens cast?
Lens cast results when light from the lens strikes the digital sensor at shallow
angles causing areas of the image to have color casts ranging from green to
magenta. This occurs mainly with non-retrofocus wide-angle lenses.
Most non-retrofocus wide-angle lenses do not have sufficient lens coverage for
wide image sensors. Shifting and tilting such a lens adds to the lens falloff.
See: Leaf Technical Notes/Cast Effects in Wide Angle Photography (PDF)
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