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The authors discuss practical problems, focusing, and accuracy of lens arrays involved in constructing integral imaging systems. In general, it is recommended to set the focusing for the object during capture to infinity. The positional error of the elemental lens arrangement significantly affects the image quality when the image is reconstructed near the observer. An experimental system in consideration of the practical problems that uses an extremely high resolution video system is described. Some pictures obtained by the system show the specific characteristics of this spatial imaging type of system.