At this point Eric, I really don't know what went wrong. First I had trouble with my SD card, camera would not respond card error. Changed card, everything seemed fine, so I thought it was card issue. I shoot jpeg and raw together. I proceeded to photograph. First seven shots seemed Ok, then No8 forward came out green or purple, so I changed aperture to get fast shutter speed. Next image was purple, this went back and forth as I changed aperture. then I removed the two filters, same result. If I tried to compensate for white snow, it would go purple; if I underexposed or shot with no compensation, it would go green. Then finally I changed lens and everything seemed fine. I put filters back on, again fine. I guess I will try the lens again tomorrow to try and pinpoint problem. I thought it was bent aperture lever, but it seems fine by eye. It's almost like CA out of control! Still scratching my head.