i frequently use very dark ND filters, ones with greater than 3 stops of cutoff. has anyone found a brand that has very low color cast? the B+W filter i use most is a 1000x (3.0 or about 10 stops) filter, but it gives everything a medium brown cast. i have to adjust it away in Photoshop after scanning. the lens i most want it for has a 67mm thread. i have a Cokin P holder too, if that type of filter is available. i know i can stack three 0.9 filters together but that's two filters too many.
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