Light passing through the filter from an off axis angle, will pass through a thicker portion of the filter causing less light to hit the film/sensor.
I find they are too thick, and the vignetting that it causes is higher than the better glass fitlers (Heliopan or B+W) I think it reduces only a couple of stops of IR as apposed to the 10 stops of visible light. I do think part of the tint comes from IR/UV contamination. My Heliopan ND3 has a different cast on my D700 than on my D2x. I dont really have an answer for you, but I would look up the spectral properties of each NF filter. If this is the case the cast should be stronger in the edges, otherwise try a flou filter for correction or shoot a profile with ColorCheckerĬokin seem to have the worst colour cast, doubt IR blocking filter will be the answer, better to buy a Hitech 10 stop ND or Lee instead. The magenta cast you are seeing is likely caused by the coatings.
I remember reading a while ago that it's caused by cutting amount of light but not IR that hits the sensor? Would IR filter help or should I just get some screw in ND filters that already have IR blocking also? Some are impossible to correct in Photoshop. I was wondering if IR blocking filter would help me with color shift when doing long exposures? I have Cokin ND filters and when stacking two or three ND8 I get a really bad magenta cast even when using custom white balance.
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