The Fiddlehead Standard Focus Pattern Chart from DSC Labs is a chart designed for calibrating the focus on your video camera. Many video professionals consider calibration charts a necessity for optimizing camera performance and the production value of images. This chart has been designed with that philosophy in mind and works equally well in engineering or production work. This model was created in collaboration with Stephen Lucas in Burbank. It features a decreasing radii spiral pattern that is designed to provide a visual pop at the precise point of optimum focus.