Stefan wrote on 02/06/2003 09:23:16:
> My assumption is the following: As in photography we talk about
> filters, the circular polariser is in fact a circular polarisation
> filter - filtering out circular polarised light rather than letting
> it pass. Therefor a photographic circular polarisation filter would
> physically be a linear polariser. Anything else wouldn't make sense
> - physically speaking that is ;-)
Circular polarizer filters are linear polarizers plus an additional
'filter' to depolarize the light. The second filter means that the
camera's exposure and AF work :)
See http://www.geocities.com/cokinfiltersystem/polarizer.htm
for more details. This page talks about the Cokin system but is
generally applicable...
Stuart
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