| 摘要 |
PURPOSE:To familiarize completely with the use of many kinds of interchangeable lenses of the same mount, and to execute an automatic exposure control by providing a signal selecting circuit for selecting an input signal from corresponding different terminals. CONSTITUTION:When an interchangeable lens having digital diaphragm information is installed, an analog input terminal 6' is short-circuited because an input terminal position is different, ad the minimum and maximum digital diaphragm value information from a digital input terminal 4' is selected by a signal selecting circuit 7. In the same way, when an interchangeable lens having analog diaphragm information is installed, the terminal 4 is short-circuited and the analog minimum and maximum diaphragm value information from a terminal 5' is converted to digital information by an A/D converter 8 and selected by the circuit 7. Also, when an interchangeable lens having no digital diaphragm information nor analog diaphragm information is installed, both the terminals 4', 5' are short-circuited, and the information from a diaphragm lever 3 is supplied to an operating circuit 9. According to them, many kinds of interchangeable lenses of the same mount are mastered completely and the automatic exposure control can be executed. |
