Nodal Point Explanation
The nodal point is a point inside the
lens where light paths cross before being focused onto a film plane within
the camera. The nodal point is important for many
reasons. It’s responsible for making sure that the first photo taken
will line up with the last photo shot during your 360º pan. If the
camera was not setup at its nodal point than we would most likely be introduced
to an optical distortion, called parallax distortion.
One way to experience parallax is to hold out your hand, and with one
eye closed, place your finger over an object you see in the distance.
When you close one eye and open the other, your finger apparently "jumps"
relative to the distant object. This is parallax due to your point of
view shifting a few inches, from one eye to the other. When
our software tries to stitch two shots together that weren’t taken
with the nodal point set, it will cause a blurring or ghosting affect
along the edges of objects near the camera - thus parallax distortion