Fixed focus exposure control apparatus with reverse...

Details Fixed focus exposure control apparatus with reverse... Fixed focus exposure control apparatus with reverse...

G - Physics

03

B

95/62

G03B 3/04 (2006.01) G02B 13/18 (2006.01) G02B 27/00 (2006.01) G03B 9/24 (2006.01) G03B 15/03 (2006.01)

Patent

CA 1131969

5921 ABSTRACT OF THE DISCLOSURE An improved lens arrangement is provided for use in a camera of the type having a focal plane and a subject-to-camera distance responsive effective maximum aperture limiting control arrangement operatively disposed with respect to the focal plane. The improved lens arrangement has a reverse spherical aberration corrective characteristic which operates to reduce the effective circles of confusion associated with each of the images of different subjects within a given range of distances from the camera as formed at the focal plane by the lens arrangement in combination with the effective aperture control arrangement.

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