Nikon D2X has set a custom white balance with white A4 paper in the studio, and it is equipped with a good flash. Why is the photo red? Find a solution

From which professional forum or manual did you see that white paper can be used as a whiteboard to define white balance? White balance is a calibrated neutral color, not white. When the three primary colors 1: 1: 1 are all neutral colors. White paper filled with phosphor, the ratio is not 1: 1: 1. Finally, use less custom white balance. Now the built-in white balance of the camera is accurate enough, otherwise it will produce RAW film. In addition, when the flash is off, you need to define a custom white balance when the flash is on. You can define it in flash mode. Generally, the color temperature of the original factory flash is still very accurate. You can look at the color temperature written in the flash manual, and then directly adjust the camera color temperature to that value. If it's too much trouble, release it in RAW mode, as long as the color difference is not too outrageous and the color overflows everywhere, otherwise it can be pulled back.

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In summary, there are three points. First, you can't customize the white balance with white paper. Second, customize the white balance after the light restores the target shooting scene. Third, make movies in RAW mode.