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Fig. 1. Optical diagram of high-speed frame camera.
a series of pictures on the film FA. This lens and film arc records pictures for the rotating mirror in the range of ±45° from the position shown. For positions of the rotating mirror beyond that range it is necessary to follow the optical path B which is seen to be at 90° around the Z axis from path A. The combined field and relay lens L3B then relays the image Ii to the position I2B The image-forming rays are so directed that they pass into the relay lens L4B to form the image I SB in the film plane FB. It is thus seen that pictures are obtained for another 90° range of the rotating mirror, adjacent to the previous 90° range, or a total of 180°. Since both faces of the rotating mirror are polished, pictures can be
obtained for the entire 360°, with the exception of the region obscured by the mirrors M3A and MSB which amounts to less than 3% of the cycle in a practical case. There are always two images on the rotating-mirror face but the displacement of the relay lens arcs away from the X-Y plane insures that light from only one reaches a relay lens at any one time. Achromatic doublet lenses are used throughout since these give excellent resolution over the small angular field required. The axes of the final relay lenses are coincident with the central optical path and hence the film plane is a conic rather than a cylindric section as shown. The various lenses of the system are assigned focal lengths such that the pupils are located
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December 1952 Journal of the SMPTE Vol. 59