Means for adjusting camera low-light signal in accordance with film exposure latitude

Claim 1

In a camera having a film exposure aperture, photoelectric means, and light admitting mean adjustable to a maximum condition for minimum scene light intensity, the camera being loadable by insertion of film carrying means having structural means thereon of a predetermined conformation in accordance with the exposure latitude of film carried thereby, the combination comprising: a. first and second movable blade means, said blade means disposed in covering relation to the photoelectric means; b. first motion transmitting means interconnecting the light admitting means and said first and second blade means for transmitting adjustment of the light admitting means to said first and second blade means to form a varying mask for said photoelectric means, and thereby cause the electrical output of the photoelectric means to vary in response to adjustment of the light admitting means; c. means responsive to said output for stopping adjustment of the light admitting means when said output reaches a predetermined level; d. movable signal means actuatable in response to adjustment of the light admitting means to its maximum condition; e. movable sensing means for sensing the predetermined conformation of the structural means on the film carrying means; and f. second motion transmitting means interconnecting said sensing means and said signal means for transmitting motion of said sensing means to said signal means to position said signal means in accordance with the exposure latitude of the film and thereby accordingly change said position of contact with said signal means.