BGA-F-025959-0000 Detail of the St. Peter frontal depicting the calling of Peter and Andrew, by Guido da Siena, in the Pinacoteca Nazionale of Siena Credit: Alinari Archives, Florence WARNING: Permission must be required for non editorial use. Please contact Alinari Archives Artist: Guido da Siena Date of artwork: XIII sec Period and style: Middle Ages Location: Siena, National Picture Gallery Photographer: Brogi Date of photography: 1937 Place of photography: Siena, Pinacoteca Nazionale People: Jesus Christ, Andrew, Peter Collection: Alinari Archives-Brogi Archive, Florence Object type: glass plate Photographic technique: N silver gelatin dry negative Dimensioni: 21 X 27 cm Technical info Image sizes (pixel): 2432 X 1856 Image sizes (cm at 300 dpi): 20 X 15 Image sizes (MB): 3.49 Color space: RGB