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When a camera with an anamorphic lens shows some artifacts, they are usually either an oval bokeh (vertical) or a lens-flare steak (horizontal).

  • How much of these artifacts are due to the "anamorphic function" of the lens and how much is due to the physical build?
  • The form of the bokeh is defined by the shape of the lens, but is all of the distortion due to that?
  • Or does the squeeze and unsqueeze of the image produce additional artifacts?
  • Why are the bokeh and lensflairs not either both horizontal or both vertical?

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