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Mike Williams <mik### [at] nospamplease> wrote in message
Md6### [at] econymdemoncouk...
> Wasn't it Chris Huff who wrote:
> >In article <38c2577b@news.povray.org>, "PatchWerk"
> ><blu### [at] hotmailcom> wrote:
> >
> >> ...it does indeed work by an interference process, and it is
> >> indeed  the very process we call iridescence... although the
> >> incoming  (refracted) light remains largely unaffected, as the
> >> multiple glasses  inside the lens seem to cancel each other's
> >> color out.
> >
> >That would be for achromatic lenses, then. I have seen this
> >iridescence  on the lenses of pretty cheap cameras, which would
> >probably not have  achromatic lenses. The effects from the
> >iridescence are probably just  too small to notice.
>
> Yes. I'd guess that the purpose of an antireflective coating is to
> increase the amount of light that enters the camera. It's not
> possible for the interference process to achieve this equally
> across the
> spectrum, so the lens manufacturers choose to maximize the boost in
> the yellow. The purpleness of the reflection would be a side effect
> of less yellow being reflected.
>
> --
> Mike Williams * ##
> Gentleman of Leisure



The antireflective coating is used to minimize the refraction of
bright lights falling into the photo field.
It works by making a gradual passage from the air IOR and the lens
one.
Thats the way it works but I really don't know hot to achieve the
same effect with povray.


Massimiliano Cirri

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