ExpoDisc 58mm Neutral White Balance Filter allows digital photographers to quickly and easily set an accurate custom white balance. Consistently producing excellent results in natural, artificial, and studio lighting. It is far easier to use than any gray card, white card or calibration target. Simply place this filter in front of your lens and capture the incident light while setting your camera’s custom white balance. Using an ExpoDisc 58mm Neutral White Balance Filter will virtually eliminate the need for RAW or JPEG post-capture color adjustments. ExpoDisc 58mm Professional Neutral White Balance Digital Camera Lens Filter