DGK Color Tools DGK-CSD Set of 3 High Resolution 8" by 11" Chrome SD Professional Lens Test Chart for Lens Testing - Calibration - Resolution and Color Calibration for Digital Photo and Video set of 3 charts - Front of chart has multiple bar, wedge, zone, and star patterns for lens testing. Works with any film or digital camera / video system. Back of chart has rectilinear grid pattern for lens distortion testing (barrel and pincushion distortion testing). Precise color wheel, CMYK and natural color targets to evaluate and adjust camera color. Crossed 11-step grayscales for setting white balance, exposure or gamma - may also be used with a waveform monitor or vectorscope. High-resolution screen print on premium grade 14 point coated paper.