Flash photographic device

Abstract

Abstract PURPOSE:To eliminate the need for manual operation regarding the judgement of distance to a subject during flash photography and to perform flash photography which lessens the probability to produce a state that the quantity of light emission is deficient, by outputting aperture information for flash photography corresponding to focal length information inputted from an interchangeable lens when a flash photographic mode signal is inputted from a flash emitting device, and controlling the aperture of a camera on the basis of the aperture information. CONSTITUTION:When the flash photographic mode signal is inputted to a terminal JB6 of the camera body, a data selector MP6 inputs an exposure time signal for flash photography to an exposure time controller CT. Further, an aperature controller CA inputs a signal which is inputted to a terminal JB3 of the camera body indicates an aperture value corresponding to the focal length of a lens LE mounted on the camera body through the data selector MP0. The aperture controller CA counts pulses which are inputted from a pulse generator PG and correspond to the number of stop-down stages of the lens LE by the rotation of a stop-down ring and compares the counted value with data DELTAAv on the number of stop-down stages from the output terminal OP2 of a mu-com1 to stop the rotation of the stop-down ring when the both coincide with each other, the aperature is controlled.

Inventors

• 👤 Masaaki Nakai
• 👤 政昭 中井
• 👤 Nobuyuki Taniguchi
• 👤 信行 谷口
• 👤 Toru Inoue
• 👤 透 井上
• 👤 Takanobu Tamaki
• 👤 太巻　隆信
• 👤 Hiroshi Hosomizu
• 👤 細水　博
• 👤 Masatake Niwa
• 👤 丹羽　正武
• 👤 Minoru Sekida
• 👤 関田　実

Bibliographic Details