| 摘要 |
PURPOSE:To perform proper daylight synchronized flash photography by controlling the quantity of lighting of an electric flash to a value set according to the relation between an elapsed time and information on distance to a subject, and starting shutter closing operation when the integrated quantity of light reaches or almost reaches proper exposure. CONSTITUTION:Information obtained by converting light into an electric signal by a light measuring circuit 6 is inputted to an integration circuit 7, whose integral output 8 is inputted to the 1st and the 2nd comparators 9 and 10. The 1st comparator 9 compares the integral output 8 with the 1st specific value 12 below the proper quantity 11 of exposure and the 2nd comparator 10 compares the integral output 8 with the 2nd specific value 13 set to or almost to the proper quantity of exposure; and the 1st and the 2nd detection outputs 14 and 15 are inputted to a CPU 16 which controls the whole. A shutter driving circuit 17 opens and closes a shutter 3 according to an opening command 18 and a closing command 19 from the CPU 16. A distance measuring circuit 20 receives a distance measurement command 21 from the CPU 16 to measure the distance to a subject 1 and outputs distance information 23 together with a distance measurement end pulse 22 when the measurement is completed. |
