The camera is a photographic equipment I was using NikonD750. As a preliminary experiment, try the shutter speed by {1/500, / 250, / 125, 1 / 60,1 / 30,1 / 15,1 / 8,1 / 4,1 / 2}, each shutter speed The difference between the I and the reference value 1/30 that fall within a certain range. From preliminary experiments, image had became Cho properly black and white in the 1/250 and the outside of value than 1/8. F value at the time of shooting F / 16, ISO was unified at 400. And shooting pattern that does not pinch the circular polarization filter between the camera and the display, we've taken two patterns of shooting pattern sandwiching the circular polarization filter.
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