When there was no digital camera, what kind of camera was it at that time?

The era before digital is the era of film, to SLR for example, the basic structure of the camera at that time and now SLR is the same, the only difference is that the digital SLR using electronic photoreceptors to complete the light-sensitive elements, record the impact of the traditional camera uses the photochemical reaction of silver halide film to complete the light-sensitive, and after that, the use of chemicals for development, fixing, release printing. If you take apart a digital SLR and a film SLR, you'll find that behind the digital SLR reflector is the electronic light-sensitive element, and a whole bunch of accompanying electronic equipment, and behind the film SLR's reflector is the film.LZ can search for film and film cameras in BAIDU images to see what that all looks like, but the results may disappoint you, as you won't be able to see much of a difference from the outside.

As for further back, there are dry plates, wet plates, and so on.