Some dumb questions I have been wondering about

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

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?

Best wishes

Mike
http://www.pentaxphotogallery.com/artists/mikeward

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