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The diagram illustrates a photo shoot carried out while turning the camera around oneself. The mechanical rotation axis is the photographer in this case.
This method of shooting generates a lot of parallax caused by the significant value of the Variation (radius of the circle of the various positions of the camera’s optical center).
In a panoramic shoot, a significant parallax error in overlapping areas between the photographs will create blurring due to the fact that the software will have to mix slightly shifted information. In the diagram above, for example, you can imagine that superposition of photographs 1 and 2 will mix the objects of the first shot (A) and the second shot (B), which will produce artifacts and blurs.
When carrying out a panoramic shoot, it is necessary to avoid this parallax
error at the time of the shoot, by reducing the Variation to the minimum,
i.e. by bringing back the optical center on the mechanical rotation axis of
the camera. This is defined as the "Nodal Point".
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