| 摘要 |
PURPOSE:To reduce a trouble of adjustment and the cost by equalizing exposure information before photographing to an exposure control value in photographing, by equalizing the quantity of photodetection of a photodetector for exposure control in photographing to that in observation. CONSTITUTION:In observation, light from an object passes through photographic lens 3 and the 1st mirror 5 and is reflected by the 2nd mirror 6 to strike photodetector 2. In photographing, the light passed through photographic lens 3 is reflected by film 8 or shutter blind 7 with a reflection coefficient close to that of the film to strike photodetector 2. So that the quantity of photodetection of photodetector 2 in observation will be equal to that in photographing, transmission factors and reflection factors of photometric mirrors 5 and 6 are fixed. Consequently, exposure information before photographing becomes equal to an exposure control value in photographing and because only one photodetector 2 is in use, the trouble and cost are reduced. In addition, the exposure is determined by previously flashing the speed light device. |
