Re: Flat pan or circular pan? #capturing #howto #alignment

Etienne Monneret (Perso)

Le 29/01/2021 à 02:07, David B via a écrit :
It seems for the best view when focused on a single point would be the circular motion because it is more like the natural geometry of the human eyes.  Where this may be worse is when you shift your attention through the image on locations that are not a this focal point.  Then it can be less natural?
Maybe for best viewing of other points throughout the image a flat pan is better?

When you are shooting with cameras aligned perfectly parallel, the image is a circular scan of the field of view. When viewed at screen, this circular scan is perfectly restored on your screen, and you have to converge to see it exactly like in a natural viewing.

When you are shooting with convergent cameras, when restored at screen, the rotation appears as a wrong viewing angle. Your screen is flat, and you do not have the possibility to restore the original viewing angle of your cameras. At least, you need to get two screens to display with a viewing angle between both to restore the shooting conditions.

Here is a small diagram:

  1. top left: at shooting time, the cameras are well parallel. The green line is what your cameras are shooting, supposed to be displayed later on your screen. Red and blue lines are displaying what is shot for a far and a near object.
  2. top right: you display both pictures aligning the nearest point to fit the same place on your screen, with a zero parallax. All the scene is restored for your eyes exactly at the same place as the shooting time, in a natural viewing angle for the far object. This is the only way you can get the exact viewing effect on your single flat screen as at the shooting time.
  3. bottom left: at shooting time, the cameras are pointing a same place on the scene. The green line is style what your cameras are shooting.
  4. bottom right: you display both pictures, still aligning the nearest point to fit the same place, with a zero parallax. You see that the original far object now have a much larger parallax at screen, even with a high risk of divergence. If you want to restore the original parallax of the far object, you need to put the nearest object in front of your screen, with a strong negative parallax. You simply can't get back the natural viewing angles between both views as at the shooting time, except using 2 screens with an angle between them.

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