Patent ID: 6606125
Filing Date: 2003-08-12
Classification: G03B

Abstract:
A shutter, for use on an objective, for improving the depth of focus in a camera, said shutter comprising:in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360Â°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and wherein the radial transmission function drops off to 90% of the central value at a radius R1 and to 10% of the central value at a radius R2, wherein (R2âˆ’R1)>0.1 R1.