| 摘要 |
An optical filter the density of which is variable is provided in the optical path of the taking lens. The density of the filter is controlled to effect optimum exposure with freely selected aperture size and the shutter speed by means of an exposure control circuit. The density of the filter is varied by moving a filter operating member which is driven by a filter driving means. The stroke of the filter operating member is controlled by means operated by electric pulses generated by an electric circuit connected with a light measuring circuit including a photodetector to measure the scene brightness. |
