DOUBLE-SIDED WHITE BALANCE FOCUS PLATE: Double-sided 18% standard gray, one side of the gray plate has anHOW IT WORKS: auxiliary focus scale, and the other side is a white balance and reflection plate. The best tool for tuning white balance to ensure accurate exposure and color balance of your photos and videos. | HOW IT WORKS: The focus plate balances complex light scenes uniformly to 18% neutral gray, and by recording the reflected light from the focus plate through the light meter, you can get an accurate exposure value. | OPTIMAL VERSATILITY: An ideal accessory for professional photographers, this white balance double-sided plate can be used in any lighting condition, whether pre or post production. Suitable for both automatic and manual lens practice. | EASY STORAGE: The White Balance Double Sided Tray measures 30cm x 30xm and folds easily into a compact size for easy storage. A nylon zippered storage pouch is also included for easy carrying and transportation. | ACCURATE COLOR BALANCE & EXPOSURE: The focus plate can measure exposure values with handheld light meters, TTL SLR cameras, digital cameras and side-by-side cameras with metering. Using the three-color focus plate is a guarantee of high quality photos.