23/05/2019Roundshot VR Drive Instruction Manual – Firmware Version 2.023 103
5.1 Nodal point (continued)
Good nodal point: Bad nodal point (parallax effect):
The next step consists in setting the nodal point for the camera.
The correct point about which to pivot a camera for panoramic photography is the centre of the
system’s entrance pupil.
In practice, when turning the camera sideways, the relative distance between two objects
• always remains the same when the camera is at the correct nodal point
• changes when the camera is not at the correct nodal point
There are two nodal points: the front and rear nodal point. The position of the entrance pupils
for panoramic photography is a function of the camera hardware (distance from camera rear to
lens), the construction of the lens itself (centre of perspective), the zoom setting on the lens
and finally the focusing.
As there are virtually unlimited combination possibilities, it is not possible to store all nodal
points for all cameras, lenses, zoom positions and focusing distances. Therefore it is necessary
to calibrate the nodal points for your camera + lens combinations yourself.
There is a simple practical procedure to determine the nodal point:
Open the quick adaptor release so that the VR bracket and camera can be moved sideways:
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