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This paper describes the methodology adopted and the results obtained during the 3D documentation of the medieval capitals of St. Orso Collegiate Church, in Aosta, for reference and digital archiving. This task has been carried out through low cost technology entirely based on digital scanning of high quality images applying stereophotogrammetric principles. This technology allows to obtain point clouds with RGB information and geometries at different levels of complexity, processing a number of images taken with a limited set of constraints, with the use of a special acquisition equipment and through an image matching algorithm. Issue in this research was to obtain the accurate 3D information required to build models of artifacts of a such heritage importance, with a high degree of complexity. In future the 3D model will contribute to create a spatial information system which will assist conservation and restoration activities on the one hand and will be used for tourist information inside the St. Orso Collegiate Church on the other.