I think the problem may be that you are using a linear polariser instead of a circular one. Many auto focus systems do not work with linear polarisers. A CPL has an extra stage to get round this.
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Mike
Pentax K5ii & Panasonic G5 user (with far too many bits to list)
Member of North Essex Photographic Workshop
Also online with PentaxUser.co.uk, Flickr, MU-43, MFLenses...
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