Some dumb questions I have been wondering about

Started Mar 28, 2013 | Discussions thread
Barrie Davis
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Re: Some dumb questions I have been wondering about
In reply to mike703, Mar 28, 2013

mike703 wrote:

Barrie Davis wrote:

Sort of.  First there is the underlying neutral-density-filter effect which just costs a couple of stops of light.  That contribution affects the whole image equally so doesn't alter the DR.

The additional polarising effect selectively reduces in intensity specular refections (off surfaces such as glass, leaves, metal,

Polarising filters do NOT work on reflections from metal surfaces.

Polarising works on non-metal surfaces only...

... unless the light reflected is pre-polarised by a pola filter positioned over the light source itself.

How interesting (and slightly surprising).  Any idea why a metal surface behaves differently from the others?

I think it is something to do with the crystaline nature of metals when considered at the atomic level...

.... but this is only half remembered, I'm afraid, and could be wrong.

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Regards,
Baz
"Ahh... But the thing is, these guys were no ORDINARY time travellers!"

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