１引言近几年来，随着我国对外开放不断深入，我国的经济、科技、国防、工业等系统日益发展，尤其是工业产品，国内外企业积极备战，各自发挥优势，抢占市场。在这场竞争中，就以照相机行业来说，国外产品无论功能、款项，还是质量，均优以国产照相机。最值得深思，在同类照相 1 Introduction In recent years, with the deepening of China’s opening to the outside world, China’s economy, science and technology, national defense and industrial systems have been developing day by day. Especially for industrial products, domestic and foreign enterprises are actively preparing for their respective advantages and seizing the market. In this competition, to the camera industry, foreign products regardless of function, payment, or quality, are superior to domestic cameras. Most worth pondering, in the same type of camera