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Measuring methods using image correlation are now more and more often used to determine the components of strains or displacements in laboratory conditions as well as to identify defects in construction elements or machines generated during static or dynamic loads. The Q-400 system used with ISTRA 4D software is a tool for measuring the deformation of the tested object both in the plane and in three dimensions. The system works by properly illuminating the sample surface, and then analyzing the light beam reflected from the observed element before the load f(x, y) and in the subsequent stages of the load f₁(x₁, y₁). This work is part of the research on the properties of metallic materials in a three-point bending tests. The 3D image correlation system is used to determine the full displacement and strain state in bended beams. The research uses a universal testing machine Zwick&Roell Z100 with maximum load 100 kN and precision 1 N force/0.01 mm displacement. The measurement system is connected with Image Correlation System Dantec 3D. Dantec system is equipped with optical cameras used to record strains in the tension test with 50 mm lenses and have maximum resolution 2048 x 2048 pixels each. This allowed determining the full size of analysed sample in the working area of universal testing machine.