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Using the KiWi™
HOW DO I LOCATE MY NODAL POINT ?
This is one of the most frequently asked questions when it comes
to QTVR panorama creation. Once you understand the basics,
you’ll be able to easily locate the nodal point for any camera
and lens combination.
Simply put, the nodal point is the point inside your camera
where the light rays converge and flip over. When shooting a
QTVR panorama It’s necessary to rotate about this point to
eliminate the image mismatch caused by parallax error.
It’s also worth noting that the nodal point is not the same as
the film plane, which is often marked on the underneath side
of many 35mm cameras. Generally, for most 35mm cameras
and lenses, the nodal point is located somewhere towards the
center of the lens barrel.
Parallax error can be easily demonstrated by this simple ex-
periment. Close one eye and hold your index finger upright
about six inches away from your open eye. Rock your head from
side to side. Notice how your finger moves with respect to the
background. This relative movement is due to the fact that
you’re not rotating your head around your eye’s nodal point,
which is somewhere in the center of your eyeball. Instead, you’re
rotating about your spine which is several inches to the rear
and off to one side. It is this relative side-to-side motion that
we will strive to eliminate when setting up a camera for VR
panoramas.