>
> > I'm totally mystified. Anyone have a hypothesis about what
> > was going on
> > here?
>
> Yeah, I reckon it's a purely digital phenomenon.
>
> I'd say in the 20D the 1's in the digital sensor are lined up
> at right angles to the direction of polarization of the
> reflected light (not allowing the light to be detected) while
> in the A1 they are lined up parallel (allowing the light to
> be detected).
>
You should repeat the experiment with the A1 rotated 90 degrees about the
optical axis from its current position.
...Wayne
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