Hi Guys, Newbie trying his best to set white balance manually. When i measure from a white wall or white business card I am getting a cwb error. Can the white be to bright? Surely a white card in sunlight should not be to much???? Please help. Should I use a gray card or take the white card measurement in the shade? Also when taking the measurement shutter speed and aperture comes up. Will this make any diff to the reading? Thanks in advance Toby.