For dslr--white cards are used to define white balance; when outdoors, use black cards to cover stray light, reduce exposure, balance light ratio,Video DSLR Film
White balance card--each set of exposure photography cards has a lanyard, can easily the on your body, which is very convenient to carry and avoid loss!,Camera Check for Photography
For video film--use manual exposure, no matter what color things do not need to set exposure compensation in the future, directly use this exposure parameter,White Balance Exposure Card
Camera accessory--it is manufactured with technology to ensure the of the product and can work for a long time,Custom Calibration Camera Checker
Camera checker card-- workmanship, reasonable structure, professional and practical, can bring you convenience,Exposure Photography Card