上海照相机总厂生产的海欧DF-1ETM型相机,采用开放型TTL跳灯式电子测光系统,是典型的半自动曝光单镜头反光相机。其测光电路以集成电路F3S05为核心组成,如图1所示。1.工作原理简述被摄景物反射光线由光电二极管SPD接收,并将光信号强弱转换成相应的电信号,并由F3S05的“!、”#脚送 The Haiou DF-1ETM camera, which is produced by Shanghai Camera Factory, adopts an open type TTL jump-light electronic metering system, which is a typical semi-automatic exposure single-lens reflex camera. The metering circuit to the integrated circuit F3S05 as the core composition, as shown in Figure 1. 1. The working principle of a brief description of the photographic subject reflected light received by the photodiode SPD, and the optical signal strength into the corresponding electrical signals, and by the F3S05 “!, ” # Feet