Still photographic or movie camera
AssigneesKarl Vockenhuber, Raimund Hauser
InventorsOtto Freudenschuss, Eduard Keznickl, Robert Scheiber
Life of this patent
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Abstract
A camera having a forward lens unit including a displaceable lens for providing a variable focal length, a film plane, a base objective having a fixed focal length, and an aperture diaphragm between the displaceable lens and the film plane together with automatic drive means for displacing the base objective axially in direct proportion to the diaphragm stop of the aperture diaphragm to thereby shift the image plane defined by the forward lens unit and the base objective and provide a substantially constant circle of diffusion at the film plane.
Claims23
A camera comprising
- an objective consisting of a forward lens unit and a base objective having fixed focal length, said forward lens unit having displaceable lens means for varying the focal length of said objective, said objective defining an image plane,
- a film plane and an aperture diaphragm arranged between said lens means and said film plane,
- said camera further comprising means automatically shifting said image plane for defining a substantially constant circle of diffusion at said film plane when imaging an object with different focal length settings and openings of the aperture diaphragm,
- said means comprising drive means for displacing said base objective substantially in direct proportion to the diaphragm stop k=f/d of the aperture diaphragm in an axial direction, where f designates the focal length of the objective and d denotes the diameter of the entrance pupil.
A camera comprising an objective consisting of a forward lens unit and a base objective having fixed focal length, said forward lens unit having displaceable lens means for varying the focal length of said objective,
- said objective defining an image plane, and a film plane and an aperture diaphragm arranged between said lens means and said film plane, wherein said objective is designed to have, at least over a certain area, an aperture defect that shifts said image plane for defining a substantially constant circle of diffusion at said film plane when imaging an object with different focal length settings and openings of the aperture diaphragm, by means of marginal rays according to the condition
- v = U .times. k,
- where v is the distance of the circle of diffusion with a diameter U from the focal point and where k is the aperture stop as defined by the condition k = (f/d), wherein f is the focal length in each case and d the diameter of the entrance pupil.
Dependencies are inferred from the claim text.