摄影术的一个重要特点就是在瞬间捕捉光,然后加以记录。虽然早在公元前5世纪,中国人就已经发现物体发出或反射出的光束通过黑暗房间墙上的一个小孔就会在对面墙上形成该物体的倒影, 但他们并未将此发现发展为摄影术。而西方却利用这一原理在17世纪末发明了便携式相机,此后又发现银盐变黑不是因为热和空气, 而是光的作用,这成为胶卷发展的基础,直到1828年前后最早照片 An important feature of photography is capturing light in an instant and recording it. Although as early as the 5th century BC, the Chinese had already discovered that a light beam emitted or reflected by an object passed through a small hole in the wall of a dark room and would form a reflection of the object on the opposite wall, they did not develop this discovery into Photography. The West, however, used this principle to create a portable camera at the end of the 17th century. Later, it was found that the darkening of the silver salt was not due to heat and air, but to light, which became the basis of film development until the earliest photos of 1828