Alain <kua### [at] videotronca> wrote:

>
> Spherical aberation cause a coma effect. Bright points at some distance
> from the axis tend to show some egg or plume shaped fuzzyness oriented
> radialy arount the center point of the image.
>

....and also 'purple fringing' toward the edges. (It's interesting that the
cause of *that* is not well-understood, based on the research I've done.) My
Canon camera does show this, unfortunately.  BTW, I seem to recall that one
of the newsgroup members here-- I don't remember who it was-- came up with some
code to actually *create* this purple fringing, during POV-Ray renders (the
purpose being to make our CG renders look more like real photos.) That extra
bit of realism-- well, 'lens realism'-- would be useful for my matchmoving
scheme.

>
> Barreling can be simulated using the spherical or ultra whide angle POV
> cameras.
>

Hmm, that *is* true. I should experiment with that idea.

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