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I also have the CLS CCD filter but I went for the 2" version as I thought it might be more useful in the future if I ever get a dedicated CCD camera. I started out holding it in front of a lens and taking a picture of a grey card and using that as the custom white balance. Was not completly happy. I then measured the RGand B channels of the RAW grey card image (through the filter) in Imagesplus and found I had to multiply the R by .59 and the B by .57 to bring it back to grey. I now do the same with my images and I think it is a little better but more tweaking is still required. My DSLR is a modded one. Result attached, also not perfect I know.
Neale
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