I use the 6120ws to take the photo of a small LED screen. I expose the led screen three times. The first time I adjust lens focus to make photo blur as left-top in the picture, the led point picture has black triple. Secondly, with the same lens focus, increased the exposure time, also make a photo as right-top in the picture. Thirdly, I adjust the lens focus to take a clearly photo, the left led and right led on the screen have a different bright spot. And i try to rotate the sreen, the led pixels also looks like shift the same direction. And I use LRGB filters to take the photo, the phenomena still exists. The filters with an anti-reflection coating. Does any experts know what the problem is?