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>Well, I was being precise in the use of words. The camera was panning, rotating about a vertical axis, to follow an actress who was walking through a park area. The result was that she stayed relatively unmoving in the center of the picture while the background composed of trees, grass and other people, moved steadily past. That does in fact result in a definite Pulfrich effect if you are wearing the sunglass lens over the appropriate eye.
Actually, from your description, the camera was probably TRUCKING ("tracking" is also correct), in that it was itself moving to keep up with the actress. Had it been PANNING, it would have been stationary, turning on its axis, and the ambulatory actress would not have "stayed relatively unmoving in the center of the picture." In this case, it doesn't matter too much, however. As long as there is relative action (the actress moving against the background) there is the possibility of a Pulfrich effect occurring. Had the actress not been in the shot, however, it would be a different matter entirely. A PANNING camera (rotating but not moving itself) will photograph a scene without altering the apparent spacial relationships between different objects which are stationary, and thus there will be no apparent depth watching with Pulfrich glasses. However, if the camera is TRUCKING, then spacial relationships will change (foreground objects will appear to be moving faster than distant objects) and you will get depth through the glasses. (And before the etymologically elite among us trounce on me, yes, I am aware that the OBJECTS aren't moving--the camera is! Give it a rest!)
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