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Test Targets, Calibration Targets, and ReticlesThorlabs offers a variety of test and calibration targets for use in imaging systems. With these targets, the user is able to determine the resolution, distortion, magnification, or spatial frequency response of an imaging system. Fluorescent slides and disks are also available for calibrating and aligning fluorescence imaging systems. Additionally, Thorlabs offers reticles for use in superimposing a crosshair or concentric circle pattern on an imaged object.