The LBTEK NBS 1952 test target, also known as the NBS 25 test target, is used to reduce spurious resolution and prevent inaccurate test results. The line pairs on the NBS 1952 test target are arranged progressively from the periphery to the center, with three vertical or three horizontal lines forming one line set. It provides 48 line sets, divided into 24 different frequencies. The numbers marked in the pattern indicate the resolution of the adjacent horizontal and vertical line sets, making the test target symmetric about the diagonal from the top-left to the bottom-right. If the test target is scanned from left to right or top to bottom, the line frequency increases continuously until reaching the center and then decreases from the other side. Whether scanning horizontally or vertically, a single pass across the entire pattern will cover every frequency on the test target, allowing the resolution of the optical system to be determined with unidirectional motion. Additionally, LBTEK offers customization services for resolution test targets. For other requirements, please contact LBTEK Technical Support.