The authenticity of these pictures has been established by expert testimony which links the second picture, Commission Exhibit No. 133-B, to Oswald's Imperial Reflex camera, with which Marina Oswald testified she took the pictures.87 The negative of that picture, Commission Exhibit No. 133-B, was found among Oswald's possessions.88 Using a recognized technique of determining whether a picture was taken with a particular camera, Shaneyfelt compared this negative with a negative which he made by taking a new picture with Oswald's camera.89 He concluded that the negative of Exhibit No. 133-B was exposed in Oswald's Imperial Reflex camera to the exclusion of all other cameras. 90 He could not test Exhibit No. 133-A in the same way because the negative was never recovered. 91 Both pictures, however, have identical backgrounds and lighting and, judging from the shadows, were taken at the same angle. They are photographs of the same scene.92 Since Exhibit No. 133-B was taken with Oswald's camera, it is reasonably certain that Exhibit No. 133-A was taken by the same camera at the same time, as Marina Oswald testified. Moreover, Shaneyfelt testified that in his opinion the photographs were not composites of two different photographs and that Oswald's face had not been superimposed on another body.93