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michel_tobby.md

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Site de Michel Tobby

Mine d'or sur la photographie : http://michel.thoby.free.fr/

Apropos of the Entrance Pupil and of No-Parallax Point (NPP)

  • Entrance pupil = virtual image of the center of the aperture stop
  • The virtual entrance pupil is moving around a complex shape wrt to the angle to the optical axis (it is only on the optical axis when the angle is 0)
  • No Parallax point (NPP) = point around which the camera can be pivoted that allows the total absence of parallax between two overlapping photo => used to make panoramic photos (for a given incidence angle)
  • With fisheye lens, because of the pupils movement, there is not a no parallax point. Only a Least Parallax Point (LPP)
  • The camera should be rotated around a point to avoid parallax
  • Vignetting = difference of illumination between the center and the periphery of a photo

Models for the various classical lens projections

  • presents the 5 classical projection models: stereographic, equisolid, equidistant, orthographic
  • Opinion: this is not "Distortion", this is a feature