| http://www.w3.org/ns/prov#value | - It is an object of the present invention to further improve the retro-focus type lens previously proposed by the assignee and to provide a retro-focus type lens suitable as a projection lens for a color liquid crystal projection TV set in which the number of lenses is reduced and yet a predetermined back focal length is easily obtained and moreover aberrations such as distortion and flare are corr
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