Camera lens attachments

Claim 1

An attachment for the taking lens of a camera of the type having a single taking lens and which comprises a deviating prism supported in a mounting adapted to be detachably secured to the lens holder of the single lens with the emergence face of the prism in front of the single lens, the prism being of a kind providing two successive reflections of the transmitted light beam between incidence and emergence without alteration of the image attitude of the beam, said prism including an incidence face through which light enters the prism, a reflecting face separated from the incidence face by a first predetermined angle and which reflects light entering the prism back to a portion of said incidence face, said prism having an emergence face substantially parallel to the plane of the single taking lens, the dimensions of the incidence face and the reflecting face of the prism being predetermined dimensions and said prism formed of glass having a predetermined refractive index whereby the field of view of the camera is substantially as great with the attachment as without it and including a mask disposed adjacent to but spaced from the incidence face, said mask having an aperture through which an incident light beam may enter the prism and said mask functioning to mask the portion of the incidence face which again reflects the light reflected by the reflecting face.