Camera Labs

I bought a Hoya Super HMC circular polar from Hong Kong.

I have a nagging doubt and a question for Gordon/Thomas. If this filter was a cheap copy and was a linear not circular polar, what effect would I expect on my D80 exposures?

I ask because one of the problems I have had with the D80 is that all my polar shots were under-exposed and the white balance (auto) was shot to bits in most cases. I have post processed and actually got some great photos once corrected, but out of the can they were shocking.

I have since shot with white balance set to daylight and the colour shift goes but I would not expect the auto WB to be thrown by a polariser, or should I?

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Canon IXUS 850IS. Nikon D80 & 18-200VR

Well, the least I can say is that my D80 with Hoya circular pol behaves quite normal: no need to correct WB or exposure. But I haven'T yet found the source that tells me, what the effect of linear pol-filters could be. So I'm not sure about it.
If you use "linear polarizer problems DSLR" @ Google, one of the top 10 entries goes to a test of a user that says: "Linear polariser & 20D: no problem! (quick test)". And someone else said that AF and exposure (on a Pentax) were ok with a linear pol-filter.
If linear is making troubles I'd expect the troubles to be dependent on the angle of adjustment (of the filter) on your D80. Have you tried this?

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

No I have not been very scientific about it so far - why is life such a rush? I never have the time to do anything properly any more!!

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Canon IXUS 850IS. Nikon D80 & 18-200VR