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I don't know the answer, but can you provide more details of what you are looking for? Where is this in the optical chain? On the sensor? Do you mean optical lowpass filter? An optical lowpass filter does not have any inherent color, but I'm guessing one used in this camera could have an additional color filtering function, like infrared suppression, and be blue in color.
A Google search led to a Facebook page, but I am not a member of Facebook. You might try there.
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