Tv lens with still-taking function

Abstract

In a still-image-capturing system, a still-image-capturing lens group having totally the same configuration (the same number of lens sheets, lens form, and lens material) as the lens group used only for a TV-image-capturing system is disposed downstream a half mirror, and a rectangular prism is disposed for providing a luminous flux with an optical path length identical to that within a color-decomposing prism when the luminous flux passes therethrough. In another aspect, a focal length conversion lens group for changing the focal length of zoom lens groups and a total reflection mirror is disposed on the optical axis of the zoom lens groups exclusively from each other. In still another aspect, an electronic still camera is attached to the still-image-capturing system. If the size of each of image-capturing devices in the TV-image-capturing system is the same as that of the image-capturing device of the electronic still camera, letting the focal length of the fifth lens group be f,, the focal length of the taking lens of the electronic still camera be f,, and the converter magnification of the converter lens be M,, the converter lens satisfying the expression of f,=M,·f,can make the angles of views of the TV-image-capturing and still-image-capturing systems coincide with each other. In still another aspect, a mechanical shutter is disposed between the half mirror and the still-image-capturing lens group, such as to be opened only during the charge storage period of the first field in response to an image readout operation for one frame.