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The white balance seems to be out, that could be caused be several factors, but it is unlikely to be the polarising filter. I would double check to see if if your white balance is correctly set.

I would also read up on using histograms as an exposure guide (not a major issue as it was within about 2/3rds of a stop of what I would have judged to right).

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Thanks for your help Paul. I will read up on histograms.

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