Features: 1. This is a 30cm focus plate, gray on one side and white on the other 2. It plays the role of a gray plate, and is suitable for both automatic and manual lens practice. 3. 18% standard gray, one side of the gray plate, there are auxiliary focusing scale, one side is a white plate. Is a good accessory for tuning white balance, with a carrying case 4. focus plate is the benchmark for accurate detection of volume. Richly layered, color-saturated photos come from accurate exposure. If the light of the shooting scene is too bright or too dark, it may cause the exposure to be off. 5. The focus plate can balance a scene with complex light to 18% neutral gray across the board, and by recording the reflected light from the focus plate through the light meter, you can get an accurate exposure value. 6. The focus plate can be used with handheld light meters, TTL SLR cameras, digital cameras, and side-by-side cameras with metering to measure exposure values. Using a three-color focus plate is a guarantee of taking high-quality photos. Description: This is a tricolor card to help photographers take pictures, the white card is used to adjust the white balance, the gray card is used to adjust the exposure, and the black card is used to shade. Specifications: Size: 30cm Applicable scene: camera focus Package Included: 1 * focus plate Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object. _x000D_