The Linkstar CA-WB1012 White Balance Filter is created from special optic material and is designed to assist you in achieving the correct white balance values. Simply place the CA-WB1012 in front of your camera lens and take a photo with manual focus. The CA-WB1012 breaks the light and allows the camera to detect the correct white balance values. Save the white balance values of the photo taken, remove the filter and continue shooting with these white balance settings.