The first stage (1893—1924)

The camera body was changed from wooden box to metal body, and the lens was developed from a single crescent lens to multiple groups of positive lenses to correct aberration. The lens is equipped with an aperture and shutter to control exposure.

The second stage (1925 ——1953)

1925, the German company Lai Ci improved the Barnach camera and produced a 135 camera with Elma lens, which was used for head-up observation and was named Leica I. Leica 135 camera is easy to carry and shoot, which promotes the development and popularization of news photography.

The third stage (1954 ——1984)

1954 Akfa company in Germany produced the first Akfa EE (electric eye) 135 head-up viewfinder camera with off-mirror metering function. Since then, electronic technology has been applied to the field of cameras.

The fourth stage (from 1985)

1985 In February and September, the 135 single-lens reflective autofocus camera produced by Minolta Company of Japan was introduced, which marked that the camera production had entered a stage dominated by electronic technology and gradually intelligent.