I experienced noticeable darkened centre when I use this ND2-400 filter with my Phantom 3 Pro. The 2 sides are brighter. The result is the same in a video I took, not sure what is the cause.DJI_0005 by XCELL posted Dec 8, 2015 at 4:33 PMDJI_0005 by XCELL posted Dec 8, 2015 at 4:33 PM
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