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:

snip

2) Does using a Polarising filter reduce the Dynamic Range of an image taken in sunlight with a digital camera?

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.

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

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