| 摘要 |
A magnetic recording type of photographic apparatus comprises an iris for controlling the amount of light incident from a subject, an image sensor for converting a light signal obtained through the iris into an electrical signal, a converting circuit for converting a video signal supplied from the image sensor into a standard television signal, a motion-image signal processing circuit for applying signal processing to the standard television signal provided by the converting circuit and forming a motion-image signal, a still-image signal processing circuit for applying signal processing to the standard television signal provided by the converting circuit and forming a still-image signal, a recording circuit for recording the still-image signal supplied from the still-image signal processing circuit in a still-image recording area of a video track formed obliquely with respect to a longitudinal axis of a magnetic tape, and for recording the motion-image signal supplied from the motion-image signal processing circuit in a motion-image recording area of the video track, an integrating circuit for integrating a video luminance signal supplied from the converting circuit, an arithmetic circuit for calculating a difference between the video luminance signal from the integrating circuit and a reference value, an iris controlling circuit for controlling the iris in accordance with the difference calculated by the arithmetic circuit, and a gain setting circuit for setting a gain of the arithmetic
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