Mr. Shaneyfelt. Yes; I did.
Mr. Eisenberg. What conclusion did you come to?
Mr. Shaneyfelt. I reached the conclusion that the negative, which is Commission Exhibit 749, was exposed in the camera, Commission Exhibit 750, and no other camera.
Mr. Eisenberg. Can you explain how you were able to arrive at such a conclusion?
Mr. Shaneyfelt. Yes; I can.
In order to make an examination of this type, it is necessary to make a negative with the camera, using the camera, because the examination is based on the aperture at the back of the camera, at the film plane.
Mr. Eisenberg. Have you prepared a photograph of that aperture at the film plane?
Mr. Shaneyfelt. Yes; I have an enlarged photograph of that aperture, that I made so that it would better show the back of the camera, with the back removed to show the film plane opening or aperture.
Mr. Eisenberg. Did you take this photograph of the back of the camera yourself, Mr. Shaneyfelt?
Mr. Shaneyfelt. It was made under my supervision.