Response to Pinakryptol yellow in FX-2

You are probably right about film, since the red spectrum is present during exposure, I did not think about this. On the other hand the blue filter -- at least theoretically -- is not such a bad idea if one would want to get rid of some chromatic aberation from the lens. A lens is corrected for two wavelength, an apochromatic lens has additional correction for a third wavelength, the longwave red spectrum. Reducing the red sensitivity using filters could add some sharpness. Orthochromatic films achieve the higher sharpness due to the fact that they do not have to record the red spectrum.

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