The tips of the third inner ring, which correspond to a smallest feature-size of 120 nm, are barely not resolved (see Figure 5b ), in general agreement with the linear test sample. Actually the method requires only a single image to capture all the necessary. We have been using this method succesfully for years now for several applications like photography, video, automotive, machine vision and others. Second, a Siemens star test sample with 30 nm smallest features was imaged. The resolution measurement with sinusoidal Siemens stars is applicable to all digital cameras and done within minutes. Similarly, it can be applied to a camera's optical resolution by taking photographs of a Siemens star printed at high resolution and comparing photographs from different cameras to see which retained the centre detail the closest. The half-pitch cutoff resolution was estimated to be 145 nm as depicted in Figure 5a. The smallest gap visible is limited by the smallest dot of ink the printer can produce, making the Siemens star a useful tool for comparing two printers' resolutions ( DPI). When printed or displayed on a device with limited resolution, however, the spokes appear to touch at some distance from the centre. High Contrast Chrome on Quartz Glass 2mm outside target diameter 40 spoke-space pairs 6.37 cycles. Theoretically the spokes only meet at the exact centre of the star the spokes and the gaps between them become narrower the closer to the centre one looks, but they never touch except at the centre. 300 nanometer line pair resolution (150nm single spoke). It consists of a pattern of bright 'spokes' on a dark background, which radiate from a common centre and become wider as they get further from it. A Siemens star is a device used to test the resolution of optical instruments, printers and displays.

High resolution siemens star