| 摘要 |
PURPOSE:To obtain proper exposure by changing the arithmetic formula of photometric outputs in accordance with information corresponding to photographing magnification on the basis of a distance of an object and a focal distance of a photographing lens. CONSTITUTION:In a camera 1 for passing light from a photographing lens 2 through a part of a main mirror 3 and forming its image on a photodetecting sensor 6 through a submirror 4 and a photometric optical system 5, information relating to a distance up to a main object and a focal distance is obtained from the distance up to the main object and the focal distance on the basis of algorithm deciding a scene. Photographing magnification alpha focal distance/ distance of object is found out on the basis of the two information and the size of the main object on a screen is divided into three areas, large, medium and small, from the value of alpha. Thus, proper exposure can be obtained by changing a prescribed photometric output operating formula in each area. |
