Photography – Having lens converter or extension tube
Patent
1994-06-30
1998-03-10
Gray, David M.
Photography
Having lens converter or extension tube
359434, 359733, 359822, G03B 1700
Patent
active
057272360
ABSTRACT:
An optical system having the features of a wide angle lens, a deep field lens and a close focusing lens is comprised of an objective lens, a field lens and a relay lens aligned on an optical axis in that sequence for the objective lens to form an intermediate image at or near the field lens and for the field lens and relay lens to transmit that same image to a smaller final image at the plane of the film of a film camera or charge coupled device of a video camera. The objective lens preferably has a fixed focal length and a wide open aperture for forming the intermediate image of a larger size than is otherwise normal for an objective lens of that focal length. Preferably, the relay lens has the iris and focusing mechanism whereby the objective lens and field lens are not required to be used for aperture control and focusing. The optical system provides an extended optical axis for accommodating lighting of a near object being photographed. In modifications of the basic optical system, the optical axis is turned 90.degree. one or more times and rotatable joints are provided in the lens barrel for versatile positioning of the objective lens relative to the camera with appropriate prisms for inverting and reversing the orientation of the final image at the film or CCD detector plane.
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