Originally posted by Parallax It's the lens coating. (on the subject lens.)
Don't think so. Assuming the OP is talking about the bands showing on the white background. Those go clear across.
Not sure what that might be, lighting artifact?
Try this:
Shoot the background with nothing on it and see if they are still there.
Shoot the background with nothing on it at various AA simulator settings, including off.
Try moving your lights around to test if the lines move.
Do these show in the RAW files or only the jpg?
Do they correspond to sensor direction? (Was the first shot landscape and the second in portrait orientation)
Try a different background to test if the artifacts are occurring because of the background. It looks shiny, it is acrylic?