ND Filters

I am using a Nikon D200 with a 10 - 20 Sigma lens.

The camera is set to RAW and the white balance to Auto.

So off I went with a B+W 110 (3.0) SH NDx1000 - in other words capable of about 10 stops reduction.

The only way I could get a half decent exposure was to take a reading from the camera in Aperture priority mode and then switch to manual and wind the exposure down 30 stops.Yes 30 stops.

All the images came out with a brownish caste as if I had shot at the wrong white balance and looked like they had a vignette around them...see example.

So quite a disappointing day out but managed to rescue some in CS3.

Today I did a few tests and found that if I drop the white balance to 4000 I get a better image that I can improve with curves etc in Photoshop.

Do other of you have problems using strong ND filters
Eddie