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Peter Fogg wrote:
>
>
> Herbert Prinz wrote:
>
>
>         How do you explain the steadily increasing sun diameter
>         towards the sides of the picture?
>
> Two possible explanations:
> 1.  Diffusion - to both sides the sun's image appears as more diffuse,
> thus apparently larger, compared to the rather clearer sun at the centre.
> 2.  Apparent distortion.  I say apparent because wide-angle lenses
> take an arc and record that onto a plane, which also gets displayed
> as a plane.  So objects towards the edges tend to be recorded in
> 'splayed-out' fashion - an inelegant expression but can't think of a
> better way to put that.
>
1. If it's diffusion: But that happens in the atmosphere - not in the
camera, right? So why is there more diffusion if the sun is higher up?
2. If it's distortion: Why does it not equally affect the distance of
the sun from the horizon? (Or else this is a noon shot after all.)

Herbert

   

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