Wondering if listmembers have found special treatment necessary when using a circular polarizer  on a D-SLR.  I have an Omega CP, admittedly not the B+H or Heliopan, but as always worked acceptably well with film.  Shot a bunch with it on the coast the other day, and results look a bit strange - kind of flat with a greyish-purple tinge.  Do you need to treat shooting with a CP as a custom WB situation?  Any ideas welcome.  

Ken
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