Focus warning system for a manually-focused still video camera h

Details Focus warning system for a manually-focused still video camera h Focus warning system for a manually-focused still video camera h

1986-12-10

1988-04-19

Lev, Robert

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821313, 358909, 358228, 354219, 352137, 352141, H04N 5232

Patent

active

047394110

ABSTRACT:
A manually-focused video camera provides a movie image for an electronic viewfinder and a still image for recording apparatus. A diaphragm in the optical section of the camera determines the optical aperture presented to incoming image light, which coincidentally establishes the depth of field in which the subject remains in focus. When the aperture necessary for a still image exceeds the aperture used for the movie image by, e.g., three aperture stops, a warning system in the camera produces a control signal. The existence of this signal indicates a potential focusing problem due to the disparity between aperture values and the reduced depth of field in the corresponding still image. The signal is used, e.g., to illuminate a warning element in the viewfinder or to insert a neutral density filter into the path of incoming light, in the latter case forcing the movie aperture to approach the still aperture and thereby causing the movie depth of field to approach the still depth of field.

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