Wayne wrote, of cross-polarisers and flash:
> More bad news: Reflections from an electrically conductive
> surface are not polarised, so using the polarisers doesn't help.
I think I disagree. Surely the thing about metallic surfaces is that
they have no polarising effect, so if the light is polarised in a
particular plane when it hits the surface, it stays polarised
afterwards.
The converse is if you have something like water, which does polarise.
You only need one polarising filter to stop reflections from water (if
you're at the right angle) because the polarising effect of the water
itself is doing the same job as the part of the cross-polariser on the
flash.
Does that make sense?
John
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